Originally used within the kid's television cartoon series "Flintstones Kids" middle 10 minute featurette "Captain Caveman", this term is used as a descriptor for very startling observances and interactions: In most cases, gigantic, fat and ugly girls.
Most famously used in the phrase
UNGABUNGA CAPTAIN CAVEMAN!(obvious statement here)!
A citizen of a very backward and primitive nation, more often than not African. Ofttimes they have arrived in a modern technologically advanced nation and are not yet house-trained.