A Locked Slut
A locked slut is someone who’s stuck with one person and will be a total mess just for them, even if it means doing something completely ridiculous.
She’s a locked slut. She did a belly dance in a chicken suit just to make her boyfriend happy.
He’s a locked slut. He let his girlfriend throw confetti in his mouth at a party.
That girl is a locked slut. She ate a whole pizza in one bite just to make her boyfriend laugh.