A fat bat
A person so high, lazy, and bloated they could barely move. They probably live in a couch and eat cereal for dinner.
My neighbor is a fat bat. He eats cereal at 3 PM and still doesn’t get up.
She’s a fat bat. I tried to wake her, and she said, ‘I’ll sleep through the apocalypse.’
That kid is a fat bat. He failed math and still passed out on the floor.