F'donk 

Verb: When someone of the male gender rips his penis out of his pants and promptly proceeds to slap it across the face of an unsuspecting female. The sound created by this slapping action closely resembles the word "F'donk".

Yo hommie, i f'donked the shit out of my GF last night.

F'donk by JIZ IZ HOW WE DO April 28, 2005

f'donkulous 

(adj) form of f'donk; the state of being cock-slapped unconscious

The bitch passed out after we got f'donkulous on her ass.

f'donkulous by amp18 January 29, 2007