Pr biscuit Share definition Flag a slang term for the perscription drug percocet. used when one desires to be discret about ones drug habits "hey man do you know where I can score a Pr biscuit?" Pr biscuit by rusty t shacklerford October 26, 2008 0 0 Get merch Get the Pr biscuit mug. Buy Now — $32.95 See more merch