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.
by Arch0wl May 16, 2005
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One of the few Oriental saints, recognized by the Catholic Church. He watches over some of the most annoying miscreants on mother earth, they are also known as "the never ending talkers" You may also know him as "SHUT THE FUCK UP"
One of our co-workers never did know quite when to shut his mouth, so we always tried to call on St Fu to intervene before we beat him like a red headed step child.
by cobraglf October 01, 2007
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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
by jer February 24, 2005
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