A contraction of the phrase "what the fuck"; one that is commonly posted on forums as an expression of confusion. It is often said by people with no creativity, imagination or unique traits, who regurgitate this vapid phrase in order to "comically" display their sheer lack of humour/understanding towards anything even slightly out of the ordinary. (see normality).
A user, with no sense of self respect, encounters a slightly funny/absurd YouTube video and feels the need to comment.