idk how widespread this is, but here's one I was hit with recently that I needed to have explained to me: "terete", which fighting game players were saying whenever a player won with a cinematic super—turns out it's a we-say-this-so-often-we-don't-inflect-anymore derivation of "te ♪re~ ♪tte~ ♪", ie the opening "you wa shock" refrain from Fist of the North Star, which plays in instrumental form whenever you hit a Fatal KO in the Arcsys fighting game
