A cupcake someone has licked the icing off of and throw away.
It means no one likes you they just like what comes with you.
âSarah is such a trash muffin, I only like her for her boat. â
âAlayna is a trash muffin but itâs better then being alone during lunch.â
âI think iâm just a trash muffin to Paige and Reagan. They only ever hang out with me when they need a ride.â