What is Hilarity?
1.
A hilarious situation. Usually followed by "ensuing".
Man with knife tries to rob bank. Guards have guns. Hilarity ensues
2.
To show something as funny, or comical, but only in a sacastic sense, or when you are laughing at your own joke
You: Damn! She looks toe up from the flo up! *looking in the mirror and laughs*
Friend: Oh, you and your hilarity *rolls eyes and looks*
You: That I am! *missing the insult*
funny ,sarcastic ,hilarious
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3.
Someone who is uniquely hilarious, a rare humor find of someone, hence the 'rarity' association.
"He's great he is, he's a hilarity"
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4.
to be in a state of ecstacy; laughing uncuntrolably; see hilared.
i was in hilarity, as kaylie made me laugh