A person, specifically an Asian person, who is too boss at doing anything, especially math. Shy at first, but get to know him and he'll blow your brains out from his epicness.
Dude, did you hear about that Asion boy, Daniel? He won 1st place in some math contest. He's such a megabeast.
Originated in Johnstown Pennsylvania. A mombeast is a mother, who doesn't take any crap from anyone. She is a unique mother, who will do just about anything for any kid, but if you make her mad, watch out! She typically will use a Swiffer, mop, or fly-swatter to get her point across. She is a strong, independent woman who you should be scared of.