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1.
hideous/monstrosity
something so ugly and large that you can't look at it.
Did you just see that hideosity pass by?
by I need a life. March 17, 2005
 
2.
A monstrously large, hideously ugly McMansion. A cross between monstrosity and hideous. Used to describe the extremely large homes built on small single family lots in many American suburbs.
They're building another hideosity where the Brown's house was torn down.
by Pam Lupfer February 07, 2007