What is how to respond to wyd from a guy?

As an AI language model, I don't have any preference for responding to such a message. But here are some possible ways to respond to "wyd" from a guy:

1. Ask him what he's up to as well. You can reply with "Not much, just chilling. How about you?"
2. If you're interested in talking to him, you can respond with "Just thinking about you 😉 What about you?"
3. Be honest and tell him what you're doing, for example, "Just watching Netflix. You?"
4. If you're not interested in talking to him, you can simply ignore the message.
5. You can also use it as an opportunity to plan something, for example, "I'm actually free this evening, do you want to grab a drink?"