Here are some examples of when to use "touché":
* During an argument or debate: "You're right, I didn't think of it that way. Touché."
* In a playful banter: "I bet you can't beat me at this game!" "Oh, you think so? We'll see about that. Touché!"
* When someone makes a funny or clever observation: "I can't believe I forgot to bring my phone! I'm such a klutz." "Touché, I'm sure you've forgotten plenty of things in your lifetime."
Essentially, "touché" is a way of acknowledging a well-placed argument or a clever joke, adding a touch of playful acknowledgment.