A male or female that is stingy, lives off other people mainly hence they wait for crumbs (opportunities) to come to them. They are a common breed and display traits of being "loose" or just a plain loser.
Other slang: Snackratacus (ultimate snack rat)
Dude you shouldn't hook up with her, she's a total snack rat.
Man, he didn't even pay for anything this weekend..I think we just got snack rated by king snackratacus
Other wise known as Scrat. Half squirrel and half rat. Accurately named after Scrat from ice age. Scrat is known for his skittishness and obssesion over nuts. Particularly one nut.