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1.
Someone who has yellow teeth, specifically caused by the act of someone urinating into their open mouth. After the urine is inside the mouth, it is used as if it was mouthwash before being expelled. Usually performed upon a Male by a Female, although studies have shown it happening to the Female and even within homosexual couples in rare occations.

- Please note that this is not a common occurance within the human race, and only the most mentally damaged people attempt this.
Anthony: Did you see that kid's teeth?
Dane: That's Timmy. He's a pissmouth.
Anthony: Oh my god. Who'd he get it from?
Dane: His girlfriend is into that kind of stuff.
by Roflcoptersoisoisoilololololol September 12, 2010