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Generally stands for 'What the fuck'. Most people use a question mark afterwards to get the point through. Rather than using the same term for the other 'w's, who, when, where, and why, it makes more sense to actually state the word and follow it with 'tf'

Capitalization doesn't really matter.
This term can also be likened to 'What the shit?' which is more comical and has a tantamount meaning.
WTF?
WhoTH?
WhenTF?

WTS?
by chalupamonk March 03, 2003
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An acronym puritan parents like to text to their well-mannered teenagers frequently: "What the Fun!"
Daniel's mum is a queen of WTF's: she often uses it a dozen times in a single message.
via giphy
by MathPlus November 04, 2016
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The World Taekwondo Federation.
WTF, holds many competitions throughout the world.
WTF, as far as i know, remain blissfully unaware of the other meaning of WTF. Or maybe they just don't feel like changing.
by t3h n00bz 7a!k l!k3 t3his July 26, 2006
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Guy #1: Dude! I'm going to the WTF world tournament!
Guy #2: Uhh... what do you do in a "What the Fuck" tournament?
by george April 20, 2005
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