Duh

Duh is a popular term that sarcastically points out that something is overly obvious. If someone tells you something you already know or that seems self-evident, you might respond with "duh" to express your disbelief that they felt the need to say it. It acts as a verbal eye-roll, making it clear that the information you've just received is redundant or insulting to your intelligence.

Originating from the mid-20th century, "duh" has become a staple in casual conversations worldwide. It can also be seen in variations like "no duh," which adds even more emphasis to the sentiment. Because it's so effective at conveying a sense of exasperation, it remains popular in texting, memes, and face-to-face interactions.