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Something that is hilariously funny, so much so that the laughter produced is alarmingly loud.
Foxy01: How do you get your picture in the yearbook?
CoolGriffon: By NOT getting your picture take, that's how.
Foxy01: Why don't you suck my penis, John?
CoolGriffon: Because I'm not a fag like you!
Foxy01: Hey, you don't have to be gay to enjoy a good BJ.
CoolGriffon: Ok you can shut up, horse ass.
FunkyBrat: Oh my god this fight is HILARIOUD!!
hilarioud by FunkeyRat April 26, 2006
Something that is hilariously funny, so much so that the laughter produced is alarmingly loud.
Foxy01: How do you get your picture in the yearbook?
CoolGriffon: By NOT getting your picture taken, that's how.
Foxy01: Why don't you suck my penis, John?
CoolGriffon: Because I'm not a fag like you!
Foxy01: Hey, you don't have to be gay to enjoy a good BJ.
CoolGriffon: Ok you can shut up, horse ass.
FunkyBrat: Oh my god this fight is HILARIOUD!!
hilarioud by FunkeyRat April 26, 2006
something being so funny that you accidentally spell hilarious wrong because your laughing so much
a dyslexic man walked into a bra is a hilarioud joke
hilarioud by Dim February 8, 2004

hilariocity 

Used to define a so-bad-it's-good movie. It's such an atrocity, it's hilarious. Hilariocity.
Did you see The Room? It's such a hilariocity.
The Wicker Man starring Nicolas Cage is one of the greatest hilariocities of all time.
hilariocity by IAMtheAK August 8, 2016

Hilarious and original 

A reply to a post online that is so overused it is no longer funny, hence the intense sarcasm in both words
Post: Ayy lmao
Reply: Hilarious and original

Mentally Hilarious 

A 'better' alternative to using the word 'crazy' or 'insane' to someone. Or just a fun way to call someone crazy. Also, 'mentally jolly' can be used. From the Family Guy episode 'The Fat Guy Strangler'.
"Dr, is my brother really insane?"
"Mrs Griffin, we don't use the word 'insane', we prefer the term 'mentally hilarious'"