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rude slang An initialism of "shut the fuck up." Used primarily in text messages and online communications.
1. Be quiet; stop speaking. Would you kindly STFU? I'm sick of you coming on these forums just to complain! A: "I'm going to report you and get your whole account banned!" B: "Seriously, STFU dude! It's oversensitive losers like you who make social media so toxic!"
2. An exclamation of surprise or disbelief. A: "You're not going to believe this, but I just won $2 million!" B: "STFU! Are you joking me?" A: "I just found out my script got picked up by a movie studio!" B: "WHAT! STFU, that's incredible!"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.