A birdbath is a sexual act where someone kneels on the ground with their head tilted back and their mouth wide open. They then act a a recepticle for urine or other liquids.

When the man has previously had sex with a woman, specifically in her vagina (see back alley bird bath for anal), and then that same woman (or a different woman) cleans the man's genitals with their mouth; either right after sex or before next round of sex.

A level three dick trick performed by the man stretching out his ball sack into a bowl shape and pissing into it.

This is where you stretch out the excess skin of your balls to form a cup. You then proceed to fill it with your ladies favorite beverage, and give her a straw to suck it out with.

When you shove your knee into a woman's vagina and no less then 3 people pee into her anus.

Drawing out the penis during sex and cumming inside the girl's belly button.

A girl in middle of circle-jerking guys. They all cum in her mouth thus making the birdbath