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It means someone who is completely crazy. It's the mixture of two words, kos which means pussy and mashang wich means crazy
Actually kosmashang is some one who are crazier than just being mashang
I told you how kosmashang you are
by Mahi Doodool tala May 30, 2018
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"kos" is the slang Persian word for "vagina", and "mashang" is the informal Persian for "eccentric"/"stupid"/"wacko". "kos-mashang" /k(something between schwa and c:)s mashang/ is a person who is easily cheated or abused; is a freak who is completely unpredictable and is capable of doing any strange thing like flying a kite out of his/her ass, for instance; has completely no clue of what is going on. The English equivalents for "kos-mashang" can be "a jackass", "a douche-bag", "a sucker", "a freak", or maybe a "dork"/"geek".
"Kos-mashango nigash kon. Bejaye inke sandalisho bekeshe jolo dare Piano ro mikeshe tarafe khodesh."
English: "Look at the douche-bag! Instead of moving the stool closer to the Piano, he is pushing the Piano closer to the stool."

A:"In dadashet chera injoori bood? Hamash dasht darmourede sookht sohbat mikard."
B: "Velesh kon, baba. Kos-mashange."
English: A:"Why was your brother like that? All the time he was talking about fuel." B:"Don't worry about it, he is a geek."

"Be oon dadashe kos-mashangetam salam beresoon."
English: "Say hello to that jackass brother of yours too."
by Persian Headbanger January 29, 2010
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how many times do I have to say that your sister is my sister, too? don't insult me kos mashang.
by Edward the first August 15, 2018
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