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A humongous jam; a very large, well-attended party.

Originally, it was the name of the first large party thrown by the JMU Breakdance Club; it stood for “JMU Among Us”. Soon, it simply applied to large wild parties.
That party was jamongus! The hall was packed and got so hot that biddys started coming out there halter-tops.
by JMU Breakdance Club September 23, 2004
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