The surname of a family deeply rooted in " back the frick off 'fore I kill you". Usually hot headed ( thats what she said) ill tempered and irritable. Warning: prolonged exposure results in shortening of longevity.
Person 1: Hey, who that is?
Person 2: Aww shit, its a McGehee.
Person 1: Whats so bad about him?
Person 2: He gonna kill us!
Person 1: Man, you full of it
Person 2: ( falls dead)