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googlewhack

British  
/ ˈɡuːɡəlˌwæk /

noun

  1. a search of the internet, using the Google search engine and without using quote marks, for a combination of two legitimate words that yields only one result

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of googlewhack

C21: from Google + whack attempt