it's when you do everything said above AGAINST A PERSONS THROAT.
And you need to say the word as you to it.
Dude1: COONTAH! *coontah*
Dude2: Dudde1, you really need to stop that *rubs throat*
When you take your hand and make is flat like a knife. Then, you "punch" someone elses throat with side opposite to your thumb.
Dude 1: *coontah*
Dude 2: DUDE, come on! My thoat hurts like hell.
Dude 1: hehehe