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1.
Something that contains much hilariousness.
Guy: "you are so dumb. that wasnt funny at all"
girl: "are you kidding me? that was FULL of hilariosity!"
by Shmemily Bizzoyle April 04, 2008
 
2.
hilarious,duh. who couldn't figure that one out?
"you are full of hilariosity!"
by MERSI <3 November 25, 2005
 
3.
The degree to which an object or action is hilarious and/or funny.
"The hilariosity of South Park is on a high level."
by RunawayKibbles May 20, 2009