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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.
jam out by Grjohnstone October 9, 2006
To commence to do something. Usually in an excited manner.
" i jam out then commence to bust the skeet-wave."

guy 1: hey man, what you bout to do?
guy 2: Man!, i'm bout to jam out on this new game I got.
guy 1: word?! I'll come too!
jam out by Sir Nise May 13, 2006
Filling ones asshole with jam and proceeding to let someone or SOMETHING to eat it out
Oh dude yesterday my dog and I had a jam out, I can't tell if his breath is ass or jam
Jam out by YENDOR Hugs July 29, 2017

Jam out with your clam out 

The female equivalent to (ie:Rock out with your cock out ;Hang out with your wang out)
Having such a great time it's hard to explain it with words. (ie:partying too hard; having too much fun)
Just relax babe, and jam out with your clam out.

jam out with my clam out 

Time to hit the bar and jam out with my clam out.

Jam out with your clam out. 

Females have long been devoid of an expression that is on par with the male expression "Rock out with your cock out"

This is the female equivalent of the male phrase "Rock out out with your cock out"
During the Rock Band competition, Mary encouraged Jane to "Jam out with your clam out."