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.
by Aninvader April 20, 2018
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a term used when referring to a bitch in public around your elders-n-such
that son of a biscuit-eater set fire to the roller-disco
by keaton1256 February 13, 2009
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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.
Example: That boy is a son of a Biscuit-eater.
by Azure Kane May 12, 2016
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A dog that is only half trusted. When it was common for people to put biscuits and pies on the windowsill to cool, a savvy dog might snatch them. A dog that, while polite enough while there's people in the room, will certainly stick his nose in the dip if there's no one in the room. Can also apply to two-faced, sneaky people.
Keep an eye on my plate while I wash up, that dog's a biscuit eater.
by BrewSwillas September 1, 2023
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