The origins of the word "Moomba" came from an Aboriginal word meaning 'Lets get together and have fun'.
(I plan to start using this word regularly, so fair warning.)
Also, "posh" comes from "Port Out, Starboard Home." In the early days of luxury cruising and pre-air conditioning, the wealthy British did not want the hot sun shining in their staterooms as they sailed to India. Booking agents would initial these expensive cabin requests with the coveted acronym.