STFU

The opposite of SNAFU. Situation Terrific Feelin' Upbeat! First used by mid-western housewives at social gatherings such as picnics, little-league games and bingo night. The term is gradually spreading across the US and makes for confusing if not interesting web chat.
LUANN: How's the bake sale goin' Judy?
JUDY: STFU Luann! We've already met our sales goal, have run out of gingersnaps, and are about to sell our last box of cupcakes!
by superdoodie May 06, 2009
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STFU

Used to mean Shut the "F" up, also means Step the "F" up.
"If you think you are man enough, then STFU and prove it".(Reference to the phrase, "Cowboy up"). Of course both phrases are commonly used together.
"If you think you are man enough, then STFU (Step The "F" Up) and prove it, otherwise STFU (Shut The "F" Up) and sit your ass down".
by Cable Kenn February 24, 2006
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STFU

Shut the fuck up
to tell someone to be wuiet using profanity.
Mainly abbreviated in AIM, other chatting, and nerdy-ass, MMORPG computer games such as WoW or EverQuest
Guy 1: STFU n00b
Guy 2: I got tolded in tha hezay
by Zoso_maniac February 18, 2007
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STFU

A: Read the article. It's no joke.

B: STFU you liar.
by The Return of Light Joker July 20, 2009
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STFU

omg, I thought it mean Stop Foo, haha, lol.
Actually means : Shut The Fuck Up
I was joking around on myspace and sent this guy 20 messages. He wrote back and said "STFU, I don't even talk to u!". I thought that meant "Stop Foo" hehe. I'm so stupid sometimes!
by thenicegirl December 08, 2007
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STFU

Sink The Fat U-Boats
none needed...i hope
by matt March 28, 2004
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STFU

The word some noobs commonly get mixed up with Stuff You!
John: I got the last lolly pop!

Francis: STFU!!!!!!

John: Stuff you to yourself!

Francis: o.O
by Dodgy-deeds July 07, 2011
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