A pleasant way of greeting your friend first thing in the morning...when it's the afternoon. Perhaps they stayed up studying, getting fucked up, having sex, binging movies, or even talking on the phone, but regardless of what the reason was, they woke up late. Don't want to say afternoon because that's just something you dont say to someone who has slept in; atermornoon is the perfect word.

when you're hungover as shit after a spending a night drunk as a skunk