Often occurring on a Sunday, a "Shit Day" is when your ass has been on backlog for a couple days and the bill has come due.
Basically, a day where you poop at least four times and its not diarrheal in nature.
Mike: Jen, you should totally come to the movies with us!
Jen: I can't. I haven't pooped in three days and I think this is gonna be a shit day.
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