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".

STFU by Cable Kenn April 10, 2006

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

STFU by Zoso_maniac February 20, 2007

stfu

abbreviation for "shut the fuck up" used when your mad at someone, their annoying, or they're talking shit

guy 1: wow your so stupid and blah blah blah
guy 2: omg just stfu

stfu by jdcblajdbaiduch January 18, 2015

Stfu

Short for Shut The Fuck Up

Moana told Jason to STFU cos his definitions weren't funny.

Stfu by aanaaaa143 August 21, 2016

stfu

this means (shut the fuck up) or stuff you

"your ugly" says jill "stfu" says ally

stfu by bellialodogot October 28, 2017

stfu

Some dumbass comback a retarded kid uses when someone roasts them.

Person 1: Hey dude! Ur mom gay!
Person 2: stfu

stfu by Vorcee August 23, 2019

STFU

be quiet already (from shut the fuck up)

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

B: STFU you liar.

STFU by The Return of Light Joker July 19, 2009