Used as an exclamation. Can be used in suprise, or in excitement. Is usually used when referring to
something happening to someone else, as in a put-down.
From the phrase "Oh Bust!" which was used when one party would verbally bust on another and the bystander would say "Oh Bust". It has morphed from "Oh Bust" to "
Oh Bus" to "Bus" to "Busticle", or "
Oh Busticle".