A variation of the phrase "what the fuck" which is used to show shock or anger. This variation is mainly used among military groups because it gives the recipient of the remark the effect that he has been reached over a two way radio.
Used when uncertainty arises over a person’s meaning or object in mind with a statement
Friend 1 to Friend 2:Hey man did you see that new movie with the zombies and the pirates?
*Friend 2 and Friend 3 both look confused*
Friend 3: What is blud yapping over?
A variation of 'what the fuck', an expression of disbelief.
WTFO, however, is used when the disbelief is caused by a betrayal - when you betray someone you 'fuck them over'.
Bill: I told your g/f you ditched her last night to go bar-hopping.
Dave: What the fuck, over? You know I was at work covering for you!