A song off of Incubus' album Fungus Amongus. Technically this is not a word, although some claim it to mean "high like us". It is actually a slang term for insane or crazy
"you must be absolutely hilikus!"
by succubus November 15, 2004
Get the hilikusmug. you've got to be hilikus!
by smokemychronic April 17, 2005
Get the hilikusmug. 