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.

some kind of socko word.
a sarcastic half-retarded word derived from hilarious.

Making one self humorist

When something is so funny you forget how to spell hilarious and spell it as it sounds, but wrong.