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1.
When something is so indescribably stupid, failed, or disgusting, someone responds to it like this.
Usually on forums and teh internetz
bob: *posts gay Nintendo hentai*

john: what the fuck is this shit..?
by Link, the hero of time November 28, 2008
 
2.
A phrase showing that the one who said it is in a confused, and/or flabbergasted manner. Most commonly used when finding your spouse cheating, or watching Disney Channel.
Man 1: What the fuck is this shit?

Man 2: I'm fucking your wife while watching Disney Channel.
by Whatthefuckisthisshit? August 28, 2010