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1.
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.
by JIZ IZ HOW WE DO April 28, 2005