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1.
The act of recalling the past and going on and on and on about telling your past, like a stereotypical Elderly Vietnam Veteran. (Hence, Nam Vet.)
Person 1: Well, when I was a little kid... *goes on and on and on*

Person 2: Dude! This is not the time to be namvetting!
by BobcatXtreme February 16, 2010