Today's word, jactitation, made me think of a slang term that my middle school students used to use (I've been teaching elementary school recently, and I haven't heard the term). The slang term is "jack," and I have heard it used as "stealing" ("He jacked my pencil!") and as "annoying" or "teasing" ("I'm just jackin' with ya.")

I'm guessing that the "stealing" sense is a shortened form of "highjacked," but I'm wondering whether the "annoying" sense is a shortened form of jactitation.

Thanks for years of great words!