It can be used as a swear or as a answer to a question when you don't know what to answer but you consider the other person stupid.
It is translated literaly by "your dead mothers people"
Exampels:
Ce morÈii mÄ-tii vrei? / What the fuck do you want?
-Cum de a lovit maÅina? / How did he hit the car?
-MorÈii mÄ-sii?! / I don't know,but he is stupid.
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