Similar to 'berserk', but far more whimsical and fun.
Also far more irritating, annoying, and exasperating to anyone in the vicinity who is not burgerking.
"Ben partied so hard he just went burgerk and murdered all the eskimos at his igloo party. But in a fun way."
Skinny kid: I've never eaten McDonalds...cuz the Burger King PWNZ McDonalds!
Fat kid:...Shut up. *Falls over*