The callsign of a Los Angeles radio station in Roger Waters' 1987 concept album.
Radio KAOS is about a 23-year-old disabled man from Wales named Billy.
(noun) \ga-ka-shun\ An all-man vacation. Often disguised as "bonding." But really, it's just plain gay.
"Mike, John, and Lawrence are going to Portland for their annual vacation."
"You mean GAYcation..."