1 definition by Robharry53

Shit biscuit

A fist full of human fecal matter that was acquired through an anal fisting.

Friend 1: "yo! I still got shit under my finger nails"

Friend 2: "nasty! From what?"

Friend 1: "from fist fucking some nasty bitch for shit biscuits last night"

by Robharry53 January 11, 2017