Izat rally suthern?

Toeday tha speaker said he had an expression found only in da South. Iz herd it and all but Iz wandering if it is just the south.

Hez describin' a sit chu ayshun when someone duz sumptin really stupid. We say, "All man hez just ignerint."

Duz ehni one else say dat? "Boy, u iz just ignerint."

I have herd dis one also. "When da good Lord was givin' out brains, you thought they said rain and runned under the house." Whatchall call it when sum one duz sumptin stupid?