Nor Cal expression to denote something as very amusing, used primarily by 15-19 year old, male suburbanite mall dwellers.
Dude, that Napoleon Dynamite shirt at Hot Topic was hella-larious.
by Korry July 24, 2005
Something that is extremely funny/humorous.
That shit wasn't funny, it was hellalarious!
by J. Elsworth August 11, 2008