blue moon

Originally, in a season in which four full moons occurred, the blue moon was the third of these.

In 1946, an error in the magazine *Sky and Telescope* led to the term referring to the second blue moon in a month.

Today, the phrase 'blue moon' is used to refer to an event that happens quite rarely. Interestingly, by either of the definitions given above, it would ean something that occurs on average every 2.5 years.

There'll be a blue moon in a few weeks.

I watch soap operas once in a blue moon.

by Darth Ridley March 1, 2007

blue moon

A second occurence a full moon during a calendar month is called "blue moon".

On July 31st you can see a blue moon.

by Nico Edtinger August 3, 2004

blue moon

When a smurf moons you

JohnsonHey, look at that smurf, it's mooning us.
RichardNow that's a blue moon.

by Egolistick November 18, 2004

blue moon

Ice cream flavor often compared to fruit loops. Color of ice cream is, of course, blue.

I set out to pick up a pint of chocolate ice cream, but returned with a quart of blue moon.

by dave the sconnie March 9, 2007

blue moon

to drink or get wasted

Let's go to blue moon this weekend

by Jake Coolson February 29, 2008

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