The word "欠扁" is formed by combining the character "欠", which means to owe or lack, with "扁", which literally means flat but in colloquial use functions as a verb meaning to beat up. The combination creates a literal sense of "lacking a beating" or "in need of being flattened", used as a slang term to describe someone whose actions are so provocative or annoying that they seem to deserve physical retribution.