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1.
A succinct reply to acknowledge understanding of an obscure word or phrase after you have quickly Googled it. Better than flat out asking what something means and less arrogant than feigning previous knowledge of a subject.
Conversation via cell phone text:

Non basketball fan: "Your team, Kansas, did well today right?"

Kansas fan: "Yeah they did! Rock chalk jayhawk!"

...moment to Google the phrase...

Non basketball fan: "Google nod."
by paciferal March 24, 2013