The Jargon File (version 4.4.7, 29 Dec 2003):

GIYF
 n.

    Abbrev: Google Is Your Friend. Used to suggest, gently and politely, that
    you have just asked a question of human beings that would have been better
    directed to a search engine. See also STFW.


The Free On-line Dictionary of Computing (30 December 2018):

GIYF

    Google Is Your Friend.  See STFW.

   (2014-05-23)