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 9, 2021

blue moon

A sexual act in which blue slurpee, soft drink or food dye is placed into a menstruating vagina. The subsequent period blood which comes forth, along with the blue drink is known as the blue moon, due to the blue colour and the period happening once a month, or moon.

Steve: Shana told me she was on her period last night, so I decided to give her a blue moon.
Jay: Cool digs man.

by CHOLERA MAN January 2, 2010

blue moon

(adj.) A person who is extremely odd and weird, for ordering an ice cream that is almond flavored, yet colored blue.

Some boys are just so blue moon, they ask for your number, but never call you.

by Mk!at. June 26, 2008

blue moon

the shoving of ones ass (moon) into a womans face and holding in place until the face turns blue.

"last night jessica wouldn't give me a blow job, so i decided to give her a blue moon"

by herb alfred January 6, 2007

blue moon

when a guy moons you but they also pull their balls back between their thighs

Pat enjoyed giving everyone a blue moon

by C4 December 12, 2003

once in a blue moon

To do something very rarely, once in a while.

I don't usually hang out here, just once in a blue moon.

by Roboot February 3, 2007

once in a blue moon

To do something on a very rare occasion.

Stephan will come to the office once in a blue moon.

by yurmix February 20, 2018