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1.
Neal Boortz's preferred name for a certain harpy of a senator from New York State. Though the media has been portraying her as the next Presidential candidate, despite being the little difference between her and Medussa.
"Oh look, the Hildabeast is coming town to give a speach on wealth distribution."
by Kokopelli April 28, 2006
 
2.
A student at St Hilda's - a girl's only college at Oxford university, UK. The college is in 2007 transitioning to co-ed.

The term hildabeast is probably derived from Wildebeest and is often used in a derogatory manner.
It’s hard for students to live with the Hildabeast stereotype.
by manar May 14, 2007