A Locked Slut
A locked slut is a person who’s stuck with one lover and will be a total pig just for them, even if it means doing something completely insane.
My sister is a locked slut. She let her boyfriend eat a whole cake in one bite.
He’s a locked slut. He let his girlfriend put glitter in his pants and call it a fashion statement.
That girl is a locked slut. She let her boyfriend wear a chicken suit to a restaurant.