Definition: "Herp derp" is a slang term used to mock someone who is acting foolishly or saying something unintelligent.
Use case: You can use "herp derp" in a humorous way to point out someone's silly mistake or to make fun of their lack of intelligence. For example, if someone says something really obvious or makes a mistake that is easy to avoid, you might say "herp derp" to tease them. However, it's important to use this term in a lighthearted and friendly way, as it can be seen as rude or offensive if used in a mean-spirited manner.
• Don't be a herp derp, pay attention!
• Despite his herp derp attitude, he managed to ace his exams.
• He had a herp derp expression on his face when he realized he forgot his keys.
• The herp derp of the situation was lost on her, as she failed to see the severity of the issue at hand.
• His herp derp jokes always manage to make me laugh.
• I can't believe I said that, what a herp derp moment.