SNUD2NMI Text Message

I was at the office and then it came
A text message that said SNUD2NMI
At first I didn't understand
What SNUD2NMI meant
And then I realized
It was a code I should comprehend
SNUD2NMI meant you're there already
And so where am I
Oh yes now I remember
It's your birthday love
And we're having lunch together
And so I stood and went on my way
But first I had to reply
W8LNGJNMI