When one is so totally wasted, that the brain has been shrunk to the size of a dinosaurs. Speech becomes a randomannoying incoherent screech and mobility has been reduced to heavy random stomping.The belligasaur cannot comprehend normal everyday interactions with people and is only driven by the primal need for more alcohol.
Whenever I go out to drink with this girl, she always becomes a belligasaur.
The act of appearing to orgasm while completing mundane activities, most recently seen in the Twilight movies. The female equivalent of jizzing in the pants.
Did you see her Bellagasm while Mr. Schuester sang "Bust A Move?"