1)Despite its original intentions, it is most often interpreted as "Stuff You" written in shorthand.
2)Intended to mean shut the f**k up.
Hey, stfu man.
بواسطة Willy Johnson نوفمبر/تشرين الثّاني 4, 2003
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".
بواسطة Cable Kenn فبراير/شباط 24, 2006
slang for shut the fuck up
him: stfu bitch!
her: no you stfu!
بواسطة Anymoose أكتوبر/تشرين الأوّل 1, 2005
Shortened Version of "Shut the Fuck up!" Used commonly by people in Britan and England, also on such things like AIM, MSN, and Yahoo Messenger.

Literally, they are telling you to bang that girl more quietly, producing less orgasms. Go bang that person who said STFU with a crowbar in the ass.
Guy: "STFU"
Guy 2: "You go fuck it, or I shove a crowbar up yo hole!"
Guy: "What? Go Rape a bus!"
بواسطة W/e مارس/آذَار 9, 2005
shut the fuck up
stfu heaton i own you u noob
بواسطة gg أكتوبر/تشرين الأوّل 2, 2003
1. An abbreviation for Shut The Fuck Up.

2. An abbreviation for STupid FUcker
STFU n00b stop being gay.
بواسطة vipa!!! نوفمبر/تشرين الثّاني 4, 2005
Meaning: Shut The Fuck Up! used when instant messaging
Used in the IMing world: "You stupid bitch!....STFU"
بواسطة Kirsti... yo. إبريل/نَيْسان 20, 2006
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