A pain in the neck caused by moshing or headbanging or both.
This term is a synonym for Bangover and Headbanger Whiplash.
Dude 1: Duuuuuude!!! Did you go to the (enter band of choice here) show last night?
Dude 2: Yaa dude it was moooost bodacious but I got serious mosh neck.
Dude 3: Bogus dude.