when you put whip cream in a girl's mouth and pussy or ass, and you stick a banana in the girls pussy or ass, then 2 other people eat from the tip of the banana to the end.
when a man performs a reverse deep stick sexual position on his partner (either in the pussy or asshole) while the partner eats out his asshole and/or sucks on his ball sack.
matt: hey girl you wanna get banana splitted?
girl: hell no! the last time i did that i had the taste of ass in my mouth and my pussy hurt for weeks
2 scoops of female that are sharing a Hawaiian man. Usually plain and vanilla but can spice things up by using whipped cream. Bonus points if there is a cherry on top. If they are REALLY kinky, they might add hot fudge as well.