hilariousment 

Something extremely funny?

Some guy I know said Man "she's" hot! I would tap that! And when I told him later on that it was a guy, he had a face that would kill you from hilariousment

hilariousment by CourtneyZombie June 6, 2010

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