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1.
An acronym that ask a question when you're extremely frustrated and don't have time to text all 18 characters . It consists the add in of two letters "y" and "m" to the popular acronym "wtf" meaning

What The Fuck You Mean?
Girl: I'm late
Boy: Wtfym
Girl: I'm pregnant .

Boy: Congrats! :-)
Girl: It's yours!

Boy: Wtfym!?!?
by Kyinn July 26, 2013
 
2.
Acronym for: What The Fuck Your Mom,

A stonger tense for: Wtf.
Stranger 1: Hahaha. Why do you have a face?
Stranger 2:Wtfym? o.o Why do YOU have a face?
by BoomBamBaby June 16, 2009