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I prefer the term "douchebag" for its inclusivity. People of all ages know you're calling the person an asshole. I've also noticed Mormons are less offended by "douchebag" than "asshole".
I always thought it was the third derivative of position
I don't know why, but I went into this thinking it was going to be about soda jerks.
If you've seen Steve Martin's The Jerk, you'd know he becomes a real jerk in the modern sense during the movie.
I'm too young to be a benchmark but I remember the former meaning having a connotation of being annoying to or causing problems for others, but inadvertently so. As in, you're a dimwit who means no harm, but does so because you're a dimwit. But maybe by that time the transformation was already underway.
When I hear jerk my first thought is always as the second derivative of velocity, because I had a TA in college who was specifically studying jerk as it relates to autonomous driving -- back in the 90s!

So he taught us how to calculate it and its importance, because it turns out the car can handle a lot more jerk than the humans inside!

I wonder if it used to be that people largely weren’t on the same page, and didn’t know it. It’s not like people consult dictionaries to learn what slang means, or even usually ask somebody, and the definitions are related enough that responses usually don’t distinguish them. I’ve noticed it’s not uncommon online that a post’s likes are split between opposing interpretations, like agreeing with its politics vs seeing it as satire of politics one disagrees with.
I wonder how much of it is that in today's society it is worse to be disagreeable than it is to be inept.
That is a great phrasing of the feeling I was trying to get at when I originally read this, and the kind of discussion I hoped I would find by posting it here. Thanks for finding the words.
A possible reason people forget the previous meaning despite having used it with the old meaning is that they may have understood and used the new meaning for ages but used the old meaning in more formal settings.
Makes you wonder what other words have changed meaning right under your nose, without you noticing.
It's a good time as any to remind everyone that The Jerk is still one of the funniest movies ever made. It could never be made today, and I suggest you pick up a copy if you've never seen it.
I didn’t find it very funny when it came out. It seemed too long for the single joke.
Here’s the sort of spooky thing. It’s not just that there are multiple generations who’ve never known a “jerk” was once a simpleton or sap. It’s that some of the folks who used to use it that way don’t remember that they did. When I asked my mom to define the word this week, she used the modern meaning, with no apparent recollection of her former firm conviction that a jerk was a dope, dodo, or dimwit.

I am gen-X and I have no recollection of that former meaning at all. I was 10 or 11 years old when the movie The Jerk came out, and I recall being mildly confused about the fact that he didn't really seem like a jerk, and sort of thinking that he must be acting that way on purpose.

I'm around that age and still have "some poor jerk" in my vocabulary. Any other use than that specific one still has the modern meaning for me.
Interesting. I'm thirty-something and I do seem to remember my grandparents using "jerk" to mean "idiot", but for my entire life I've always thought of it as a kid-friendly way to say "asshole".

It always confused me when my grandparents would call someone who was perfectly nice a "jerk", and it wasn't until I watched the Steve Martin movie four or five years ago that I understood why.

I've only really heard women use the term jerk, ascribed to a man.

I always found it notable because it seemed to be ascribed to behavior of that special and peculiar class where The behavior benefits the man over the concerns of the woman, with an undercurrent that the women will tolerate it because the man is of a high reproductive value.

Often to me the behavior rises to what I would think would be despicable, that is something that should result in social rejection.

I'm hoping to not unleash an incel argument here.

Just use the full term "jerk-off," and there'll be no ambiguity. Incidentally, nice guys masturbate too, so the term never made sense to me.
The meaning changing without noticing thing is interesting but not hugely surprising to me. Besides a few cartoons on TV and maybe some films, in my early life I exclusively spoke and heard British English, but with the proliferation of American English via the internet, there are a lot of words that I know full well I originally pronounced in "British", but now I'm not really sure which is the "correct" pronunciation. "Lever" and "Leverage" are good examples of words where I noticed this and had to figure out which was which. Obviously there's a difference between pronunciation and meaning, and of course I'm aware of the shift, but it feels like a similar thing.
So the movie quote says the character was a pumpkin, but definitely not a jerk. Isn't that movie from the late 70s? So the shift took place by then. Or did the movie somehow redefine it?
I believe this comes from soda jerks: the guys who jerk the soda taps and make you an egg cream or a chocolate coke. I should probably say "made," as it's a job that was eliminated by soda machines. A lot of restaurants even have customers "Jerk" their own soda, though now you just press a cup against a thingie.
I thought it was from residents of jerkwater towns.
The term "racist" used to mean someone who believed that one's race, or ethnic background was superior to another's. It was a form of belief in racial supremacy.

It didn't mean that someone used race as a form of prejudice. But for decades this hasn't been the case, and it is almost exclusively used to describe someone who uses prejudice or discriminates others on the basis of race or ethnicity.

And now we no longer have a colloquial or formal single word for someone who holds racial supremacist views, because the two ideas have commingled.

Sorry, what's the difference? If you think A is superior to B, that also means that B is inferior to A? And without empiricism, that is a prejudice? And when you can decide between things, that is also discriminating?
Reminds me of Albert Fish.
The more I learn about that guy, the less I care for him.
I remember being confused by this word when I was a kid! I was a kid in the eighties and remember reading/hearing things like "what a jerk" and thinking people were way too harsh with it. Maybe I landed too late to learn the old meaning but early enough to hear it sometimes? Or maybe I did learn it early on and then forgot with everybody else.
On a tangent from the article since this isn't a forgotten meaning of jerk but i've always been surprised at how often the 3rd derivative of position crops up usefully in life.

Just as interesting to me is the fact I've never (i don't think) had a practical use for the 4th derivative, jounce (think this is a British English term, American is snap i believe). The only place i've seen it used is in car suspension design.