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Where a person named Jon makes a comment which makes absolutely no sense to anyone but himself.
Person A: Hey Jon, what time is it?

Jon: In a paper bag up a tree being eaten by nails

Person A: What? That was total jonsense
by Killermancarro May 19, 2011
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The word used to describe all the ridiculous/stupid actions or phrases Jon Arbuckle says in the hit comic strip, Garfield. Typically, the higher the jonsense, the clearer it is that the cartoonist Jim Davis is running out of fresh ideas.
I gotta admit, there was a lot more Jonsense in today's Garfield comic; classic Jon.
by GarfieldFan45 December 28, 2018
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