looking at someone, thinking about how fit they are and thinking about being with them, checking them out basicaly.

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.

Scanning for potentials in a pub/club

The act of driving a vehicle while keeping one's head out of the sunroof.

Scoping is a online game term or leet speak, mainly used in First-Person Shooter games for killing someone with a rifle gun.

Scoping also is a sexual reference against someone. It's the new "Oi dude, CHECK that bitch out" (Replace check with Scope).
Use for when someone sees someone "attractive" in the distance and says sexist comments towards the person.

The act of scrubbing ones nipples with a toothbrush like appendage while toothpaste is applied generously to your liking

Eavesdropping over a conversation