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A mongolian monsoon happens when you are having anal sex, and penetrating at a very high rate, so air gets trapped in the colon. You then flip her/him around, cum in the eye (causing the person to squint like an asian), and punch'em in the stomach, causing the person release a monsoon out of their ass.
I gave my girlfriend a mongolian monsoon last week and my friggin' room still stinks!
by marky's mark November 29, 2007
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