a slippy
A person who’s not hot enough to get you laid, but after a few drinks, you might end up fumbling around in the back of a gas station.
My cousin’s ex is a slippy. He’s okay, but after a few beers, he’ll take you to the parking lot and try to kiss you on a car hood.
My neighbor’s a slippy. He looks like a sad pizza, but he’ll get you drunk and try to get you to take off your shirt.
I dated a slippy once. He was cute, but after a few drinks, he tried to kiss me in the middle of the grocery store.