side tail 

side tail: a woman, other than a wife or steady girlfriend, with whom a man has frequent sexual relations

Gov. Sanford went to Brazil to get some side tail.

side tail by TooSick4U July 5, 2009

Tail Side Up 

1. An "unlucky" coin found on the ground. "Unlucky" or not, your amount of money was just incremented.
2. In reference to a "dime": a woman whose body is a ten but whose face is debatable.
3. Doggy style.

1. I found a quarter on the ground. It was tail side up, but that didn't change me buying a soda.
2. Girl's a dime, but tail side up.
3. I'm 'bout to get at that bitch tail side up.

Tail Side Up by MyBoxHasInternet April 15, 2011

sidetailing 

When a female dog or cat is in heat or attracted to a male they will turn the tail to the side, showing the genitals as a gesture to show they are interested sexually. Men will use this term with other men when they notice a woman checking them out or being slutty.

"Hey man, that chick over there is totally sidetailing"

sidetailing by redeyejedi2009 July 24, 2009