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1.
an area of large moutains or hills.
The land to be surveyed was hillacious.
by Kevin Burke June 24, 2005

Words related to hillacious

delicious funny hellatious hillarious histerical
 
2.
Hillariously Delicious.
Holy crap that joke was hillacious. or wow look at that kids face how hillacious is that
by icefire2 January 22, 2007