It simply means "What the fuck", just poorly typed, possibly in an attempt to sound "cool".
*Online*
Bob: I want to be a giraffe

Jimmy: wat dafuq
Bob: Learn to type.
by uwotm80 May 29, 2015
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We in this bItch FINNA (not gonna) get ctunk

*this is when it comes in, the chorus that is.:_D*

EVEYBROWNS OM FLEEK DAJUQ
^^^^^^ herro accent ^^^^^^^ brows on fleek dafuq
by Kitty meow meow April 20, 2016
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Dafaq:
Shorter, less-vulgar saying of *The Fuck*.
Used by people because it's shorter to type/write & you can also prevent yourself from directly saying F*ck.
Dafuq did I just read??*reading disgusting sex article*

WHAT DAFAQ??!! This blasted bird just pooped in my drink!!

Dafuq is this?? Why are there worms in my salad??!
by DaFatRatWitDaCheese January 4, 2017
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