Definition: wtf

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Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

WTF

   who/what/why the fuck?  The universal interrogative particle.
   Also WTH.

Source: V.E.R.A. -- Virtual Entity of Relevant Acronyms December 2001 

WTF
        What / Where / Who / Why The Fuck (DFUe, Usenet, IRC)