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An Arabic work that literaly translates (you mother's vagina)
However, it is used in the Arabic language to cuss someone else and is considered one of the strongest most offensive phrase you can say to a person. Always expect a fight after it.
Dude, Kos Omak!

you fucking liar, Kos Omak!
Arabic for "your mother's vagina"
I like kosomak.
by haileywazhere123 July 29, 2009