Literally a combination of the expressions, "What the fuck?" and "Fuck you!/.," used(and not limited) to express both confusion and outrage. What the fuck you can also be abbreviated as WTFY(...), wtfy(...), or a have various combination of misused capitalization and spelling for a more bizarre tone(i.e. WtfU, etc.). WTFY can be expressed with an emphasis more lenient on outrage by first ending in an exclamation point, or to express more confusion by first ending in a question mark, both optionally followed respectively by their counterparts, or more of the same.
13.99 shipping and handling? WTFY!?

John: "Hey honey, I don't know you but I'm gonna try to be as obvious and degrading as I can to point out that I find you sexually attractive and my motive is to use you as an object."
Jane: "What the fuck you!?"

Brosky: "Hey dad, can I like borrow 400 dollars for my bills?"
Father: Puts down newspaper, "What the fuck you son?"
by Omega Dildoe June 8, 2009
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Used when someone does/plans/talks about something a bit crazy. A lengthened version would be "What drug are you taking, to be high enough to do that". "What are you on" is usually followed up with "Do you want a list?" even if that person is not under the influence of drugs. N.B Used in Britain, less in America
Friend 1 : "I'm gonna jump off that cliff"
Friend 2 : "What are you on?"
Friend 1 : "Do you want a list?"
by TheRealPseudonym June 18, 2014
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say if your friend is playing to much you say what is you on bro
well that's what I say
by candyonfire April 19, 2016
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Popular saying, suggesting that the person questioned, by action, saying or appearance is odd too the point of otherworldliness.
Brenda: How great is the next Brittney Spears album going to be? Robert: She has bombed the last two times around. She sucks!
Jason: I think people like to see a healthy woman dance about the stage in tight fitting cloths...
Robert: Man... What planet are you from? She is gianormous!
by soulchild from the H January 3, 2008
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What are you doing
What are you going to be doing
What are you getting yourself to
What's up? Not much man just hanging out! What about you? What are you on?
by Googleinfo February 23, 2015
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used as a comeback when someone talks shit

- made up by Ben
Person 1: You are really stupid
Person 2: What are you?
by bigbenny69 October 8, 2014
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