60's dude Share definition Flag Someone who's thought process is stuck in the past. He has usually used so many drugs that his thought process is poor. Out of touch with reality. Man, you hear what that guy said? He is crazy, a real 60's dude. 60's dude by FireCad March 22, 2011 0 0 Get merch Get the 60's dude mug. Buy Now — $32.95 See more merch