A form of greeting someone without using words.
Like a normal nod but insteading of stating with your head going down, it goes up first.

Lads normally do it instead of waving.
"Josh just gave me an upnod while i made a tit of myself by waving" :(
by EJMC February 15, 2009
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No words were spoken, just a slight upnod was all that was needed. upnod.com
by jhicken March 25, 2010
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