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Persian slang that simply means "Fuck your mom" and sometimes "Fuck you" .
Depends on the situation and the background :

This slang can be used in serious situations as a disrespectful slang , and in friendly situations to show love especially between boys .
For the serious situation and fighting :

- I'll fuck you up

+ Kose Nanat !

Friendly situations :

-Hahahaha you lost the bet

+Kose nanat ...

Or

-Bye , Say hi to your mom

+Kose nanat <3
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by Hippogryph Rider April 06, 2019
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