What does STFU mean?A slang initialism for "shut the f**k up".
Other definitions of STFU:
- Acronym for "Shut The Fuck Up" — a quick way to tell someone to be quiet.
- Short for "Shut the FUCK up". Popularized by text messages and online games.
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How to use the term
Yo man, STFU. Sit down and be quiet.
Dude, you better STFU. I don't think anyone is going to take your crap.
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