When playing basketball, they way someone sticks out their booty really exaggerated when dribbling, in triple threat, or about to shoot. Their back is arched backwards too far and their knees are low and wide apart. Looks like they're about to booty dance. Mostly, and hopefully, found in females.
Oohh damn you see number 24? She got a serious case of BasketballBooty!" "I know! She looks like she's finna break her back!
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi