Ommak

The equivalent of yo mama, derived from 'emmak'

it litrelly means ur moms pussy, but the translation is mother fuker

the literal translation is: ur mum's punany!!!! but it means u want to have a wild ride with the mum in question.
its then one of the shortest way to start a nice discussion with an arab guy , discussion that will probably ended with a direct fist in the midle of ur face as the transcription of all the love involved between u and the persone ur talkin to . of course as all insults u can combine it in may ways

the translation is write but it is different than mother fucker, it means fuck your mother, this is the way we swear at each other

It's the reply of Kos ommak, and it's means
Fuck your Mothers' Mom