*hit you sign.
Aw never mind.
I still use it unironically. It was common in my youth (I’m 54), while the thumbs-up sign was not. We used the thumbs-down sign to indicate disapproval, but not the thumbs-up for approval.
THWACK!!
Actually, I’d forgotten about that dopey “game”. Some of my dorm mates in college did that for about a year straight. In their* version, you had to hold the sign over your crotch, with the extended fingers closer to your body than the circled ones. The object, such as it was, was to make the victim look at your crotch.
*: I say “their” because, honestly, I never joined in.
A big thumbs up for the okay sign!
Well, not really but I couldn’t resist.
I have now added this to my personal lexicon. 
Me too. 
I also tend to use the shaka (hang loose) sign for a few month following a trip to Maui.
Yup, and usually accompanied by a smirk. Until this thread I didn’t know it meant okay to some people instead of yeah right.
I’ve done it, but not particularly often, and I rarely see any of my peers making said gesture.
I used to, until I had a deaf child. Since we started learning sign, we see the “OK” gesture in so many signs that it’s become more than a little ambiguous. Nowadays, I generally give the thumbs-up sign, or sign the letters “O” and “K”, or just nod my head.
I’m from the USA and generally don’t concern myself with hand gestures that are offensive in other countries unless I’m in the other country.
I use it, but say, “o-tay” when I do. I’m a SNL fan.
I use the shaka quite a bit. I study a Hawaiian martial art and it’s semi-traditional to do it in photographs. 
It’s a standard scuba diving hand symbol meaning all is fine - because thumbs-up means “go to the surface”. It’s important not to confuse them. Divers also use the shaka when pissing around for photos and so on.
I don’t use it, though, like jali, I do say “o-tay” rather often. 
I usually use the thumbs-up with a big toothy Buddy Christ -style grin in a situation where I might use the “OK” hand gesture.
I use it only in one situation. When I’m driving, and I see a nicely restored old car or custom, I’ll roll down the window and give the OK. Things yelled between moving cars are always misunderstood.
My dad’s final wife was a jazz musician in the 1940s. Sometimes, somebody would ask to sit in. If he was good, he got genuine praise. If he was not so hot, band members would broadly wink and give the OK sign, which the intruder would think was good. They were really telling each other, “Zero. He’s got nothing.”
I turn it around…“Be seeing you!”