Top Definition
A cock toothbrush is when a man is getting fellatio from a woman and ejaculates on her teeth upon climax and proceeds to swipe his cock back and forth accross her teeth in a "brushing motion" hence giving her a cock toothbrush.
Mark was getting head from Sheena and he decided to give her a cock toothbrush for her efforts.
by slapsack magoo July 26, 2010

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