SNUD2NMI Text Message

I received this text message that says SNUD2NMI. At first I thought what? And then I tried to read it again, SNUD2NMI. Hmmm. What does this mean? Could it mean what I think it means? Yes, I think it is exactly what I think it is. SNUD2NMI means san na you, dito na me. And if ever you receive that message, what do you reply? It's W8LNGJNMI.