promcest

When your prom date is one of your step-siblings, but after prom it goes TOO FAR!

Whoa!! Did you see Jamie and her step-bro Mark getting it on in his car after prom?? Total promcest!!

by Tommy Del Riot July 13, 2020

Procest

An individual who is very good at banging their sibling and/or cousin.

"Mama says that Uncle Jim-Bo is the procest of the family," Lil Sally said.

by tr33fiddy December 31, 2016

promcess

The girl of your dreams that you never want to lose

My girlfriend is a promcess

by Swagmoneyboi May 3, 2016