A term used to describe the edge or brink of something. Used very often when describing where something lies and/or is near.

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.

in and of or around the brown eye of your butthole, the circular lemon-sucked area surrounding it is the Cusp.Literally the Cusp of your poopshoot! Usually used to degrade woman by having them commit a sexual act off of it.

Meaning highest point or pinnacle in traditional English language. Also used commonly by those suffering from severe, delusional, narcissistic, psychosis!

used to describe the brim of a solo cup while playing beer pong. it can also be used as a distraction word referred to the origional defination of a butthole.

A word defined crudely by a couple of high school students bored in AP Calculus. To cusp someone is to participate in a sexual fantasy in that persons mind.