MacDinnt'int
The reply you give when someone's too dumb to know they messed up.
He said 'yo' and I was like 'MacDinnt'int!' and he had no idea what I meant.
She said 'yo' and I said 'MacDinnt'int!' and she asked what that was.
He said 'yo' and I said 'MacDinnt'int!' and he just left.