someone who likes to get fucked up and have a laugh. Usually makes a bloody show of him/herself!
A buzzer can also be a pill that makes you dance.
or alternativley and quite bizarly a buzzer can be an object or living thing that looks as if its having a good time (this is only used when extreme amounts of buzz have been consumed)
"Yuup buzzer mi lad" Is what you might say to a fellow buzzer.
"Gizza buzzer r kid!"