A phrase from two-way radio. It combines "Roger" (meaning "Received") and "Wilco" (meaning "will comply"). The letter R had been phonetic alphabet shorthand for "Received", and over the radio it became "Roger". In the military, Roger and Wilco are used exclusively. Basically it means I hear you and will comply with your wishes or command.
air traffic controller: we have had reports of severe thunder storms near you at 22000 feet. reduce altitude to 18,000 feet.
Wife: Honey pick up some milk on the way home.
Husband: Roger wilco
pilot: roger wilco
Space guy and janitor extraordinaire, main character of the Space Quest series by Sierra On-Line.
When Roger Wilco isn't mopping floors, he is usually out about protecting the universe from super villain Vohaul, escaping the likes of Arnoid, rescuing the Two Guys from Andromeda and hanging out drinking Keronian Ale.