You ALL have it wrong, the closest definition I saw is "Hype"
It's a word that originated in Atlanta and has been around since I was in elementary school (10 years ago)
Basically I'll break it down for you and how it got popular
Rap used to be all NYC in the 80's, early 90's it was West Coast, and if you haven't noticed lately the rap you will hear on all radio stations are Atlanta rappers, with all the Lil Jon, Youngbloodz, Outkast, and all southern Georgia rappers use the word "Crunk"
It does NOT mean to get fucked up off alcohol or drugs, it's original meaning has been distorted of course by the kids in the suburbs...
Basically it does mean to get Hyped up like to "Get crunk in the club" basically means get wild, "throw bows", dance, and yell and holler.
Now it can mean anything like "tight", if something is "dope" or "cool", it is now known as "crunk". Words change depending on who uses them, the West coast has distorted it as a meaning "to get fucked up" which was not the word's original intention.