Originally, a derogatory term for a dog too sorry to hunt anything but his own food. Can also be used for a person who is slow, lazy, or selfish.

An example, as from the movie it is based on (The Biscuit Eater), is a hunting dog that attacks the birds and eats them for himself instead of pointing or retrieving them.

when you're hungover as shit after a spending a night drunk as a skunk

a term used when referring to a bitch in public around your elders-n-such

The original meaning of the word Biscuit-eater comes from when a group of men masturbate together in a circle with a biscuit on the floor between them, whoever cums last on the biscuit then has to eat the biscuit.

Someone who eats scrotum.