From Longman Dictionary of Contemporary Englishcavemancave‧man /ˈkeɪvmæn/ noun (plural cavemen /-men/) [countable] 1 SXsomeone who lived in a cave many thousands of years ago2 informalVIOLENT an insulting word for a man who you think is rude, violent etc Are you going to give me the macho caveman act?
Examples from the Corpus
caveman• Consider the following scenario: a caveman leaves his cave one day setting out in order to hunt for food.• World middleweight champions Mickey Walker and Joey Giardello both came from solid middle-class homes, but fought like cavemen in the ring.• And what about the caveman that invented fire?• He understood what had driven the cavemen, and the barbarian, because the same passion was driving him.• Exhibit A in defense of the caveman. 