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A phrase uttered by a dumbfounded person or persons after witnessing an act committed by an individual that is so incredibly stupid, ridiculous, retarded, moronic, and asinine that no other words can describe the idiocy of this certain individual.
1. 4chan user: Posts yet another Rule 34 picture, this time of V for Vendetta and Chuck Norris.

Sane 4chan user: WTF is this shit?

2. Reaction to hearing Miss North Carolina state that Budapest is capital of France, and Europe is a country on Are You Smarter Than A Fifth Grader?

5th Graders: WTF is this shit?
by khaan111 June 24, 2009
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