An extremely popular 1960's hippie saying that was made ubiquitously famous by the one-of-a-kind, extremely esoteric and eventually iconic comic strips and books which appeared and evolved from within the exquisitely unique mind of the mad-genius cartoonist R. Crumb. These three simple words of encouragement reinforced the then-prevailing idea that people should be able to feel confident about staying true to their own chosen life path and not allowing the outside world to get them down or force them to change who they wanted to be.
"Whether or not that peace march you're going on does anything to stop the war or not, just remember to keep on truckin'!"
Every possible space is taken inside the car, driver, shotgun, both window seats, bitch, double bitch, and diver. So the last person has to ride trunk.
Danny (just dove into diver seat) " Lex, looks like your trunkin it"
Lex (person summonsed to the trunk) "Fuck, alright just dont go over any shitty roads"