It's bad English. It's common also in England. You shouldn't imitate it but just note that the overall meaning is negative when you see it.
When native speakers use double negatives like this, they signal that they belong (or want to belong) to a specific sub-culture. When non-natives do the same, they signal they they don't speak English properly! It may not be fair, but that's life.
As a rule, using negative words is grammatically wrong if the intended meaning is negative (two negatives = one positive)