What is duh?

The word "duh" is an informal exclamation used to express a sense of obviousness about a statement or situation. It's often employed when someone points out something that seems self-evident or when the speaker wants to imply that the listener should already know something. The expression can sometimes come off as dismissive or slightly sarcastic, depending on the context in which it is used.

The origins of "duh" aren't entirely clear, but it gained popularity in American slang during the mid-20th century and became widely used in pop culture. Over time, it has made its way into everyday conversation and is recognized and understood in many English-speaking regions.