1. To phonectically say; "stfu".
2. A shorter and quicker way to say; "shut the fuck up".
Amy: "Nick, I don't want you to cum on my face!:("
Nick: "STUFOO, bitch!"
Alicia: "But, baby, I don't want you to go out to the bar!"
Vince: "I don't care... so, stufoo."
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