14
A blue moon is a man's shaved buttocks. Preferably having shaven it using his girlfriend's razor.
"Hey, that's a nice blue moon you've got there."

"I can't go out tonight. I need some male grooming time, working on my blue moon."
by sally, that girl March 04, 2010
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15
To moon someone or a group of people, however with also pulling down your underwear or any undergarment, exposing both bare butt cheeks.
β€œSome random frat guy was drunk as hell last night and decided to blue moon us for no reason... we saw his harry asshole!”
by 69Escort4Hire69 February 27, 2019
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16
Unprovoked crippling shooting arse pain you get every now and then (once in a 'blue moon') . Feels like someone is stabbing you in the arse hole for 10 seconds.
Lucy: Arrgghhh!!

Becky: What mate?!
Lucy: feels like someone just stuck a javelin up my butt!
Becky: That'll be a blue moon mate
by MommaGeee April 09, 2021
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