Heard it on the daily show, and decided to come up with a definition for it. A dirty toothbrush is when a man has anal sex with his partner and then takes his penis and rubs it on his partners teeth.
by Yatin Shastri April 30, 2008
A dirty toothbrush is when a woman shits on her sex partners dick and he puts it in her mouth and rubs it just on her teeth.
by urbansexman August 22, 2009
A lesbian dick suck.
After the softball game, I met the coach behind the dugout and was looking to get a dirty toothbrush
by Billy Barnes February 8, 2019
The act in which a man puts a vibrating toothbrush up his partners ass and proceeds to brush his teeth with it.
by icweiner October 31, 2008