Top Definition
The ash burnt, still on your cigarette. In tradition, if one is caught with jackburn on his/ her cigarette they are to pay a fee decided by the group of regular smokers and put into a: "Jackburn jar" Once enough money is accumilated to buy one new pack of cigarettes you can say: "This one's on Jackburn" This was inspired by a friend that was always careless with his cigarettes.
"You're wasting your cigarette! Look at all that Jackburn!"
"Ha, you have jackburn! that's $1. 00 in the jackburn jar."
by Kuma Joe October 29, 2006
1 more definition
7 Words related to Jackburn
When you jack off so much you start to burn your penis from the friction.
My penis hurts from these jack burns'
by Gielskio June 04, 2003

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