When you have a friend, girlfriend business partner overseas. They are just waking up and your just going to bed, because of the time difference.
I was getting lit talking with my girl. She just woke up and said mornight.
Expression that mixes morning and night used when someone awakes at night
Guy 1: "Good mornight"
Guy 2:"What?"
Guy 1:"It's almost 1 am you dumb slut, stop your love affair with clear liquors ffs"