A slang
expression with several meanings. Usually isn't a
compliment, when you tell someone they're good it usually means they're doing something wrong and should stop. You would think it would be the opposite, hearing it, but it's a sarcastic expression.
It can be said like "
you're good", the "chur" is just a colquialism.
To be safe, usually assume it means, "you're wrong". Used a lot in the DC area.