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A way of saying "shut the fuck up", instead of actually typing it. Has less meaning than actually typing "shut the fuck up", and is often said by people that are losing an argument or can't think of a comeback.
Guy A: "You just contradicted yourself. Twice."

Guy B: "faggit"

Guy A: "Yeah, that's what I thought, you can't think of anything, loser."

Guy B: "stfu"

Guy C: Just admit you lost, Guy B.
stfu by Arch0wl May 17, 2005
Shut the fuck up.

Or, if you're in AP U.S. history, the Southern Tenant Farmers Union.
The AAA told the STFU to STFU
STFU by bishthemighty March 7, 2011
online text-speak for "shut the fuck up".
stfu by tip123456 June 25, 2009
Stfu idiot
Stfu by iiAnonymous July 8, 2020
Southern Tenant Farmers' Union (STFU): Large labor union, formed in Arkansas in 1934, which lobbied the federal government for better New Deal reforms. Dissolved in 1960. Commonly causes mirth among US History students who are aware of the acronym's double meaning.
Teacher: Joey will you please tell the class about the STFU?

Class: Hahahahahahahahaha
stfu by jer May 13, 2005