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.
That woman there, she is a mombeast!!!
by CStefan September 14, 2009