Definitions by Davian Dent

monkey's headbutt 

When one unsheathes one's erect male member, and whips it forward, with the intention of striking a blow on the victim's forehead with the engorged bell-end.

"Listen love, tuck it in or I'll give you a right ol' monkey's headbutt"

monkey's headbutt by Davian Dent December 3, 2015