The ratio of chicks to dicks (guys). Preferably 2:1 or better.
Ther higher the ratio, the higher the chance of there being a chick for your dick.

Comes from me. I invented this a few moments ago, while asking about a friend's party.

the art of remembering an arousing occurrence or some porn you watched while masturbating, often handy if you have no porn or your in the shower

The ratio of females to males in any situation, such as a party. Once the ratio has become 0 the get-together may be deemed a sausagefest, but if the ratio is undefined it is known as a tacofest.

This is a ratio of how many girls there are to guys. Usually. Of course there is the chance that 1 of the guys has 2 dicks.