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(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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