A "bootyrang" is a person whom was/is your booty call, and as hard as you have tried to get rid of them (throw them away), they keep on coming back like a boomerang
Yo, you know my booty call Michelle? I told her off so hard last week, it hurt her mother. And guess what she did last night? She called me to get some. What a bootyrang!
The act of someone slapping, swatting, or smacking another someone on the butt as they walk by as a way to tag, mark or provide admiration to the one receiving the smacks’ body.
Girl walks by; guy slaps her on the butt.
Girl 1: Ouch!
Girl 2: Dang girl you just got a Bootytag!