SUF
SUF definition by Slang.net
This page explains what the acronym "SUF" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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A gamer, friend, or family member who is mad at you may tell you to SUF, or "shut your face." This acronym is a more abrasive way of saying "shut up" or "be quiet."
Contrary to what the phrase "shut your face" may lead you to believe, someone who sends you SUF does not want you to shut your entire face. I.e. You do not need to close your eyes, plug your nostrils, or cover your ears when someone tells you to SUF. You may, however, want to stop texting, chatting, or talking, before you really upset the person you're conversing with.