Learn English – wrong (if anything) with the phrase “it don’t mean nothing”?

grammaticalitynegation

Possible Duplicate:
The grammaticality of “that don’t impress me much”
“I don’t know nothing” vs “I don’t know anything”

I've noticed that sometimes people say "It don't mean nothing". But I would expect to hear "It doesn't mean anything" or at least "It doesn't mean nothing".

Could anyone clarify why is that? Or it's totally OK to say that?

Here is an example from the movie "Hamburger Hill", http://www.youtube.com/watch?v=ernKt7JpNfM

Best Answer

Looks like I found an answer, though I couldn't find it by searching before.

The question is a duplicate of The grammaticality of "that don't impress me much"