a small,
cone-shaped turd, most commonly encountered stuck to the "
head" of
one's penis during withdrawal from an unclean anus.
"As I pulled my
cock from her chocolate starfish in anticipation of shooting my load onto her bare butt-cheeks, I noticed a smelly DUNCE CAP adorning my
head. Too late to stop, my load propelled the DUNCE CAP like a stinky poo rocket ship square into the back of her
head, knocking her unconscious."