An odd word, one that seems not to be in use much outside of Hamilton.
A munter is anyone who is loud, obnoxious, quite probably drunk, probably into rugby (you tend to be a Rugby Munter if you play/watch the game and a Rugby Geek only if you referree it and/or write the rules).
Alcohol makes normal people into munters.
Munting can be a lot of fun.
CategoryOffTopic, kinda.
One page links to Munters: