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adj.
Used to denote something incredibly extraordinary, awesome or amazing. Not to be confused with jammed up, which is a bad thing.
(1)Wow, did you go to Chad's house the other night?!? That guy knows how to throw a jam up party!
(2) How about that girl named Whitney at Chad's party? Man, she has a jam up rack!
by -The Legend- July 28, 2008
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2
An event or action incurring annoyance, inconvenience, or hassle.
You're really jammin' me up right now.

Having to have to go to downtown Seattle in rush hour was a real jam-up.

Tony was really jammed up by Schmid's use of Nova Gas in Black Ops.
by RitterKreuz April 18, 2011
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