After the sun has scorched your lower cheeks during an aggressive tanning session, drop your shorts and begin twerking and backing your red sunburnt behind up toward your partner.
Mary: *Feverishly twerking and howling*
Kenny: “I’ve seen this before… I’m about to get me some reverse baboon!”
To describe a swollen body part that is red.
Did you see Steve's nose, it was baboon ass red! So swollen from Rick punching him in the nose!
When you bump butts with someone intentionally or not. Like butterfly kisses, but for asses.
My bad, didn’t mean to give you a baboon kiss bud.