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1.
in the present state of being hilarious, someone being hilarious
the dog was causing all sorts of hilariousness; this home video is filled with hilariousness
by Doc Love December 11, 2007
 
2.
an extreme case of hilarity; a reason to use the word ROFLCOPTER
a case of merriment where one is about to cry
Girl#1-did you see SNL last night?

Girl#2-Yeah! It was extreme hilariousness!
by RandomCoolPerson101 April 08, 2010