Another way of saying "shut the fuck up." It's used in fights a lot.
Troll: lol u suck balls fuck u
Person: stfu
by A Unknown Guy. July 11, 2013
Suit The Fuck Up Sunday
Kevin started STFUS. I think I'm going to start. It's the classy thing to do.

Dave said we're poor if we don't STFUS.
by TiffanyLynnd March 25, 2012
Shut The Fuck Up Commonly Used Online Or In Games Online
"Dude that's annoying as hell STFU"
by Tha Blasta May 18, 2003
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