To fight. The definition comes from a specific punch called a hook. The hook is a lunging punch that is typically uneffective, unless you're name is Cassius Clay, Floyd Mayweather or my nigga Huck. This is the punch of choice for most individuals who can't fight; including me.
Oh shit, look at them niggas hooking over there!
You do know Lil Pistol Starter fucked my baby mama right? Well I saw him at the club last night and we started hooking on site.