A pint of Ben and Jerry's ice cream, typically eaten in a single sitting. Originates from West Point, where a slug is a cadet that is not a D1 athlete
"Dude I havent had a good meal all day I can't wait to slam a slug bucket and pizza tonight"
An accommodating fanny, both in terms of size and frequency. Which has a proclivity, even hunger, for numerous semi-flaccid penises.
Emily: Is Jade home?
Guy: No, she was invited to a party by a few truckers that we met at the Shell Garage.
Emily: It is getting awfully late.
Guy: I fear they might be filling her slug bucket.