When you and your bro find a girl at a party or some other place and you want to fuck her but your bro is being an annoyin fuck and is "cock holding you". Its as if he is holdin your cock and not letting you put it in her because he is getting in the fucking way. LIKE BEING COCK BLOCKED BUT TO THE POINT WHERE YOUR SO FUCKING ANNOYED THAT YOUR FRIEND WONT JUST LEAVE THE TWO OF YOU TO HOOK UP.

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.