Top Definition
When someone says they will do something, call out a No Jamz. This means they have "no balls" unless they do what they said they would. If they don't do it, you have to prove YOU have balls by doing it. And everybody wants testicles.
"Im gonna do a backflip off that roof over there."

"No Jamz!"

"Aww, shit."
by IgotJamz May 03, 2010
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