When a girl is giving a terrible blow job and the guy whips his dick out and hits her across the face. This contact will leave a mark. This usually occurs when a girl has braces and is scatching a man's penis in the process of a blow job
The reason why Jennifer Aniston didnt show up to the Academy Awards is being the night before she got fadonked and had a mark that resembled my penis.
by TittyFuckHerAss March 3, 2009
Get the Fadonkedmug. by Anonymous October 25, 2003
Get the fadonkmug. by Anonymous October 20, 2003
Get the fadonkmug. when one takes his flacid cack and smackes it across the face of another... possibly leaving an indentation or some sort.
Jerome whipped his monsterous cack out of his "sean john" trousers and graciously fadonk'd oprah after learning that she had cheated on him with his own father.
by Skittles March 23, 2004
Get the fadonkmug. by ChristinaLauEileen June 12, 2003
Get the fadonkmug. by david kain March 2, 2007
Get the fadonkedmug. Onomopoeia. A dong to the dome.
by suite 13 December 18, 2005
Get the fadonkmug.