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2.
In the 1920s and 1930s, jazz musicians said keep on truckin'. You can see an example of it near the end of the 1940s cartoon Dumbo, where one of the crows says "I even saw a vegetable truck," and all the crows assume the Keep on Truckin' position.
Truckin' on down the line
Hey hey hey
I say keep on truckin'
Truckin' my blues away.

Keep on truckin' mama
Truckin' my troubles away.
I say keep on truckin' mama
Truckin' my troubles away.
Do that thing you do so well
I can tell what you been doin'
By the way that you smell.
Keep on truckin' mama
Truckin' my troubles away.

This is about 40 years older than the late 1960s.
by Cap'n Bullmoose April 23, 2005
 
1.
general phrase of encouragement meaning to stay focused on a particular job or in general.
"you're doing a great job,keep on trucking."
by bungalow bill April 03, 2005
 
3.
In the 60's R Crumb came up with "keep on trucking", meaning something like nike 80's go for it.
seeya; keep on trucking.
by Mauricio Wolff March 23, 2005