To latch-on to a gay person's anus with the index finger. The term for "hooking" originates from this. Gays prefer one finger at a time although closet gays prefer the whole fist.
The west coast version of a Gill. If someone says something stupid, you reserve the right to burn the back of their neck with a quick and forceful hand rub as if you were "hooking" their neck.
Joe: I went to KFC for lunch but all they had was chicken.
Bill: Of coursedumbass, it's KFC! Thats a hook!
Joe: This is gonna hurt...