slang. 1. A despicable, deceitful, treacherous person. The governor is blaming corporations for the damage to the environment, but that dirty rat helped strip away environmental protections when she was in Congress.

What is dirty rat?

Random. Dirty Rat is an epic neutral minion card, from the Mean Streets of Gadgetzan set.

What does rat mean in slang?

These negative traits have led to the informal meaning of rat, "hateful person," "liar," or "double-crosser." You can also use rat as a verb to mean "betray or snitch on." Definitions of rat.