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Originating from the Farsi language, Kos Khun literally translates to Pussy Blood.
In Persian slang, it really means period.
Commonly used to describe people that are in a bad mood.
Student 1: "Dude I'm sick & tired of Miss Hand & her shit, she's mad annoying.."

Student 2: "Probably on her Kos Khun."
by cancersynthesis April 03, 2017
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