A polite way of asking a duck to leave you alone.

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.

1) to go off with another person to have sex.
2) to already had sex with a person

A duck off is a girl/boy who is used for forms of sex in private but is rejected in public.

Some may be considered 'sluts' while others are average girls. Only about half of them actually know that they are duck offs.

As a noun, a duckoff is a person that is always reliable for sex. As a verb, it means to have sex. It comes from Greensboro, NC and is most commonly used by Eastside Gator Crips.

a duck off is basiclly a bitch who is ugly as hell but you use her to get right