Its was supposed to be a quote from pirates of the Caribbean although I messed it up - this is the actual quote I was thinking of.
Twigg: -- Last time I saw you, you were all alone on a godforsaken island, shrinking into the distance. His fortunes aren?t improved much.
I always like a grammatical debate. Technically, it might be a double negative. But it is a reasonably well known phrase, and everyone knows what it actually means. This is what Google says:
The phrase "he ain't changed none" means that a person has not changed at all; they are still the same as they were before. It's a colloquial way of saying "he hasn't changed at all." In other words, a person is maintaining their personality and behaviors, even over time. The phrase "ain't" is a contraction of "is not" or "are not," and "none" functions as a negative reinforcing the idea of no change.
