Something a guy experiences for a few days after making out/hooking up with a girl. While infected with the morning afters, the guy will ignore the girl in question for fear of awkward conversation. This could last for weeks.
Girl 1: Me and rick made out at that party the other night
Girl 2: Awesome!
Girl 1: Yeah, but he won't answer my texts. I think he's got the morning afters!
Girl 2: That is terrible!