Can somebody explain it please? what does it mean? """naah! go do somem wif em!"""

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It makes sense when you say it aloud. :)

"Naah! go do somem wif em!"
="No, go (and) do something with them!"

Someone's slurring their words.

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Whoever is speaking is telling you to go do something with them.

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hey  ...Lina  are u remember me  ?  why dont u contact me  ?

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Nah, go do something with him.  It seems like ebonics (poor English used by somr American blacks)

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I bleive we had a convo bout dis already...
Okay that was a very bad attempt at trying to be like your friend.