Blue moon

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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