A fork of Rural Dictionary
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.
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.
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.