I've come across "DN" in my kid's texts too, and it usually stands for "dinner" or "did nothing", depending on the context of the conversation. If they're chatting with friends about plans, "DN" might mean they're having dinner or asking what's for dinner. However, if they're talking about their day, "DN" could imply they didn't do anything exciting. It's one of those slang terms that can be a bit confusing, but once you get the hang of it, it's pretty straightforward. I'd suggest asking your child to clarify what they meant by "DN" in a specific conversation to get a better understanding of how they use it.