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1.
During conversation, when any debatable topic point is raised, an automatic response to pull out one's smart phone and Google it.
Dick: "I thought licorice candy had anise in it."

Jane: "I thought licorice is a different plant than anise."

Dick: (retrieving HTC Incredible from pocket) "Hold on, I'll Google it!"

Jane: "Not again! You need to see a doctor about your Google Reflex."
by Mr Eks June 14, 2010
 
2.
The tendency to, when opening a web browser, automatically open Google.com out of habit
Girl:"Dude, check out my new website!"
Guy: "I'd love to"
Girl: "Uh, why'd you just open Google?"

Guy: "Sorry, Google Reflex"
by Montana Ranch Geek August 10, 2009