A Morning After Tee Shirt is when you where the tee shirt of the last person you had sexual intercourse with the next day to work or school.
Girl 1: Ew. Why are you wearing that ugly boys shirt?
Girl 2: No. It's my Morning After Tee Shirt from Dan.
Girl 1: Oh. Makes more sense now.
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A dude's button up shirt commonly put on by a girl when she wakes up the morning after
Damn she looks even hotter in the morning after shirt than she did last night.