I've heard it stands for team foundation server, but having used team foundation server, I now know it stands for Total Fucking Shit.
by Lucifer79 August 15, 2012
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The Fuck. Most commonly used as a shortened WTF. However, TF is used in instances when WTF takes too long to be said. TF is also used in a more exclamatory sort of phrasing.
Josh: Hey, dude, look out for the FUCKING TRAIN!

Nate: TF? *hit by train*
by Doople Banger May 13, 2009
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The Fuck? But with a sassy sort of undertone.
Tf is up with you today?
Tf do you think you're doing?
Tf ARE you doing?
by Hannah Van Miths July 26, 2015
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The Fuck? sortof a short version of WTF (What The Fuck) only it sounds cooler
person 1: ZOMG I THINK MY EYE IS FALLING OUT
person 2: tf?
by bow wow91 August 16, 2009
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Allthough it usually means "The fuck" ( shortened version of WTF ), It can be used as an abbreviation for the game Team Fortress 2, or used as an abbreviation for the fetish Transformation
Ex 1:
Guy: "I dropped my bag of condoms that I carry with me 24/7"
Other guy: "TF perma-virgin"

Ex 2:

Another Guy: "Wana play TF with me?"
Yet another fucking guy: "Yeah, sure"

Ex 3:

Kinky mf: "I have a TF fetish"
Anti kinker: "TARGET ACQUIRED"
by Damn, Im an old as donkey. April 09, 2018
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