merde quoi?

what does that mean?

Expression très... parisienne.

It's used to add emphasis at the end of a statement.
Depending on the context, it can be translated as "it's fucking obvious", "and who cares", "I don't give a flying rat ass" or even "go fuck yourself" etc...

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Ben oui, c'est comme ça, merde quoi !

How would you translate this into French: Я бля моднее вас одеваюсь.

бля=merde quoi???

merde toi!