hi-larious 

Actually it's not that funny.

A member of the ridonkulus family.

"Oh yeah? Well your mother's a whore!"
"Hi-larious"

hi-larious by Smocko November 2, 2004

hi-frickin-larious 

adj - sarcastic remark usually made after a bad joke, someone trying to be funny, or a story that was supposed to be funny, but failed miserably

Dad tells bad joke
Son: Hi-frickin-larious.

hi-frickin-larious by nitenel October 23, 2010

h.i. larious 

a term coined by a DC area kid named Branden meaning extremely funny...so funny it needed a title/name like h.r. pufnstuf. r.i. diculously funny

yo kid, that fool dave chappelle was h.i. larious. too bad comedy central tried to package him and he had to fall back.

h.i. larious by Tiste Jr. February 13, 2010

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

Hilarious and original by Mary Beth Sue April 24, 2016

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'"

Mentally Hilarious by scarlett_sweeney September 1, 2009

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

halarious

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