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Used to describe something extremely awesome. Or something good in general. Sometimes spelled with more then one "m". Also can indicate time travle if said with a scream of Chinese anger.
Friend 1: "Dude I made $500 last night"
Friend 2: "Posham!"

"Posham! Just got 10th presteige"

*Time vortex* POSHAMMMM!!! -Scream of chinese anger
by steammassimo March 13, 2010
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