Short for Jailbait Vacation. To travel somewhere with a lower than average age of consent with the singular purpose of having sex that would normally get you arrested. A bit of consensual, guilt free fun without the jail time.
"So did you hear that 16 is legal in Arkansas?"
"Seriously? I thought you had to go to Japan for that sort of thing."
"No sir, it's all right here in America. I think it's about time we took a Jaybay Vaycay and fucked some high school girls."
"Sugoi"
Lying about experiencing media and reading the wiki to fit in with your friend group. Can sometimes be shortened to "boss"
Person 1: How did he finish all those epic fantasies in one week?
Person 2: He Jaybossed them, of course!
Person 1: Oh he bossed them, he should've just read them slowly.