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

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'"

Mentally Hilarious by scarlett_sweeney September 1, 2009

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

hilariousaurus rex

When a person laughs hard enough they pull both wrists to their chest and open their mouth while rocking back and fourth but stay in their own personal space. Similar to a velocilaughter.

That girl was laughing so hard she was doing the hilariousaurus rex

hilariousaurus rex by FAKmyself August 11, 2016

Dupa Hilarious Eats 

when you eat some really good food.

Max- Bro that shit was Dupa Hilarious Eats.
Andre- We need to come eat here more often.

Dupa Hilarious Eats by Salamiboy69 June 26, 2017

hillacious 

an area of large moutains or hills.

The land to be surveyed was hillacious.

hillacious by Kevin Burke July 4, 2005