Silarious 

Acting or speaking in such a way that it is both silly and hilarious @ the same time.

Kevin acted so silarious at times, we all considered him class clown.

Silarious by amisstree January 24, 2011

Silarious 

Sad, yet hilarious.

I.E.- Trump tweeting a feud with cable hosts (as president) is funny, but the fact it is real is rather sad.

Trump's unhinged press conference was silarious.

Silarious by SardonicMommy July 2, 2017

silicious 

Delicious, yet creepy. Suggestive tones that if not welcome, are clearly sexual harassment.

His silicious comments, though very creepy, were somewhat arousing to her.

silicious by Mo D May 16, 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

Hilarious and original by Mary Beth Sue April 24, 2016

Filarious 

when something is fucking hilarious

Alize: Omg did you see Morné's hair today ?
Sonia : Hell yeah, that's Filarious

Filarious by AAAlex April 10, 2013

salacious 

a sophisticated way to say sleazy; sexual in a vulgar or overdone way.

“Mr. Thomas, my good man, are you still seeing that salacious young socialite?”
“Why yes, Dick, I am!”
“Oh, you dog!”

salacious by masokitty August 5, 2018

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