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hil-ar-i-a pronounced (hill-lair-ee-uh)
- noun

1. Archaic: amusing or humourous air, as from that recently passed through by roflcopters, roflplanes or by persons wearing lollerskates etc…

Etymology: from the former notion that it was caused by the air that is or was recently, within close proximity of such humourous objects. hil aria, funny air: see hilarious air

2. Pathology: an infectious laughter, generally prolonged and uncontrollable, caused by yet undefined, but extremely funny and boisterously joyous microscopic animals that occupy red blold cells, transmitted to humans by mosquitlols (see also: lolsquito). It is characterised mainly by rofling, loling or where one ltao (see: lmao) or any other variant of these symptoms. Hilaria is typically associated with urinary and/or fecal incontinence (see: lmaopmpappa)
Person 1: OMG what is wrong with Steveo? He's can't stop laughing, he's wet himself and it smells like he may have soiled himself also...

Person 2: That's hilariously disgusting. He must have Hilaria...

Person 3: Yeah, he does...he got bitten by a mosquitlol.
Hilaria by alpinestar84 January 14, 2009

hilariousness 

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
hilariousness by Doc Love January 4, 2008

hilacious 

Damn, That was hilacious man.
hilacious by ek1m June 19, 2008

fucking hilarous

Said to show the high extent of the funniness.
Hey did you hear about the guy who go tricked into having 10 laxatives?

Yeah that was fucking hilarous!!
fucking hilarous by Anonymight November 14, 2006

hilariousest 

(adj.) A state of being in which the term "hilarious" is no longer merely hilarious. Instead, it is most hilarious. Hence, "hilariousest".
"That sock monkey is pretty hilarious, but my pink leg warmers are the hilariousest."
hilariousest by Katie.V November 25, 2006