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a piece of road asphalt
Johnny chucked an alley biscuit at an abandoned car.
by Markimus April 21, 2006
A slang used in reference to an object capable of doing damage to someone or something. An Alley Biscuit is mostly used either in self defense or for B&E(breaking and entering).
Person 1-"Hey they say that you're going to get that ass whooped today."

Person 2-"I ain't worried about a damn thing. I'll just grab an Alley Biscuit and take care of em."

Person 1-"Yeah, you might wanna do that."
by Tuk Toi January 29, 2010