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The way far too many people spell "hilarious." It is definitely one of the most popular misspelled words in the english laguage. "Halarious" is how most people pronounce "Hilarious" in every day speech. This is the root of the word.
An IM conversation:
-------------------------

Joe: "Dood thatz halarious"

Grant: "No dude, it's your typing that's hilarious."
halarious by Cody Murray August 9, 2006
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some kind of socko word.
a sarcastic half-retarded word derived from hilarious.
"ooh yeah dats halarious, deerf"
halarious by Madd Jester September 20, 2003

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

hallatious 

meaning hilarious in larger standards. Most commonly seen on Jacksfilms videos on youtube.
Jack- "That is ducking g hallatious."
hallatious by 30secondsgone March 11, 2012

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'"
When something is so funny u combine the word "fucking and hillarious" making the word falarious
Ross "OMG the joke Matt said today was so Falarious"

Jake "IK that kid in general is Falarious"
Falarious by Eman Ekaf May 27, 2010

hilarimous

hilarimous comes from the word hilarious, but it is even funnier, usually used sarcastically
hahaha, man! that's hilarimous :P
hilarimous by nate February 25, 2005
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