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1.
one who travels back in time, stuck in a time period, does not change with the times
that dude is retronaut man, he needs to get some new clothes
by nypeet December 10, 2006
 
2.
Newspeak for hipster
I'm not a hipster, I'm a retronaut. It's more underground this way.
by bjornmuir May 18, 2011