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The day when a person's butt is exposed and everyone laughs at them like they're a punchline.
My Naked Bum Day was yesterday. My dog saw me and started barking like I was a human toilet.
I had to go to work on my Naked Bum Day. My boss gave me a warning and said I was 'not a kid anymore.'
My Naked Bum Day happened during a Zoom call. My coworker turned off his camera and laughed for ten minutes.