The physical act in which a male grips his cock in his hands and smacks the female in her face. Can also slap another male's face. Back in the Roman times, it was very common for a male to show displeasure of a concubine's felatio by fidonking her.
James Spader and Kevin Spacey can often be found fidonking each other in the showers.
by Figgins March 20, 2007
to smack a chick with your cock while your cumming
im gonna fidonk that bitch
by detheroc October 28, 2003