(n) When someone is so ashamed of somthing they did (usually the night before) that their guilt feels like physical dirtiness, leading them to take a long, thorough shower. Generally follows a walk of shame or one night stand.
Girl:I had to take 45min guilt shower after hooking up with that guy from the bar ):

or

Text to friend:Cheated on my gf last night but my water is broken, can I come over for a guilt shower?
by UDallday August 22, 2009
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The process of showering after having sex with or messing around with someone you later regret. it is often done more than once, and can be a sort of therapy. it is a psychological way of removing all traces of those people you regret being with, by "washing them off."
" On Friday I got so drunk and slept with Ian, I've been guilt showering ever since."
by annthepixie_ November 20, 2016
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