The act of giving someone a "Thug Nafty In Yo Mouf" is as follows:
The man is receiving oral sex, then proceeds to urinate AND ejaculate into the female's mouth. After he is done, he looks down at the dumb whore and says "I just 'Thug Naftied in yo mouf bitch! Now go make me a damn sandwich"
"Hey Lisa, if you come over tonight, I'll give you a Thug Nafty In Yo Mouf."
by Thugnaftyinyomouf October 15, 2007
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