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Biscuit is is a slang for a gun

and by droping the Biscuit you put or drop your gun down.
In Eminem"s song Guity Conscience ft dr.dre

dr.dre tries to stop the character"Eddie" from robing a liquor store he goes:

"Man don't do it, it's not worth it to risk it (You're right!)
Not over this shit, drop the biscuit (I will!)"
by Doc.Q March 27, 2014
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