1 definition by Grjohnstone

Top Definition
to suddenly stop, to fail at the last minute, to cancel plans for other reasons.
I thought we had plans Thursday, why did you jam out on me? I was following to closly to the car infront of me when her breaks jammed out; I couldn't stop in time. The drill press at the factory has jammed out again; coffee break time.
by Grjohnstone October 09, 2006

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