The universal response to anything for Marines (and only marines). Can be used however you see fit.
How are you today?
Rah.
My goldfish died...
Rah :(
You're stupid
RAH
Ey, YOU!
Rah?
Rah?
Rah
Hairist is when someone descriminates those of different hair color. Basically racism but with hair.
You have no soul because you're a red-head!
That's hairist!
You're dumb because you're blond.
My hair doesn't define me, you hairist.