A Holy Shirt is part of God's new merch. You can obtain it via Amazon or at a current Holy Store. Also check out the Holy Pants and the Holy Sweater.
Also used to replace "Holy shit" when your mom yells at you because you used a bad language.
Example 1:
Guy: Wow, nice Holy Shirt you got there!
Me: Yeah, I got it in the new Holy Store of the neighborhood!
Example 2:
Me: Holy sh**, I didn't finish the homework for tomorrow!
My mom: What?
Me: I mean, Holy SHIRT.
The good place season 1 episode 11, when Elanor realises its not the good place
Holy Mother Forking Shirt balls, you guys were being tortured
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