The vagina of a slut, a girl/guy who's had incredible amounts of action, and therefore is a giant slut for doing so. Used to describe the type of vagina of a big ol' whore, meaning that it's been penetrated many times, or looks like it could have been.
Created by Pervert-Smack-Kaydawg of NY, NY.
"Dude, that girl's so fuckin' hot."
"Oh, her? Yeah man, but shes a huge slutgina."