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the acronym for what you say to someone (shut the fuck up) who spells internet acronyms out loud in a real life conversation as opposed to saying the actual words
dude1: stfu (spells out stfu) I only kiss that other guy cause uh..it's my religion so wtf (spells out wtf) you talking about I'm not gay.

dude2: No you shut the fuck up you don't even know proper english and that was the dumbest bullshit I've heard since George Bush's last speech.
stfu by Tony_Chen December 15, 2008
Means "shut the fuck up!"
mostly use in fights between noobs
Noob 1: yo mamma so ugly her bestfriend thought she was a man!
Noob 2:stfu noob!
Stfu by Middi88 February 4, 2010
1. An abbreviation for Shut The Fuck Up.

2. An abbreviation for STupid FUcker
STFU by vipa!!! December 28, 2005
it means shut the fuck up used online when you want someone to stop talking
STFU by pyrokilla February 29, 2008
Set Thee Free Ulready
STFU as we live peacefully in a free country and support all of mankind in our quest for lifes better intelligence.
STFU by loverocn January 19, 2010