When a woman inserts a hairbrush into various parts of her body. Occasionally, mobile phones are used for vibrating effect.

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.

The art of writing on the Facebook wall of girls you don't know, sometimes multiple times a day.

Adj/: to give oral sex to a precession of 30 or more men in an alleyway. The semen is collected in a receptical until the last man has finished and then drank. Originated in the grenacres area of Oldham, UK.

Cheating on your girlfriend. Usually used as a secret code to other male friends when you pull a bird at the club and you are gonna get some.