When you really really fucking stink like melted pig diarrhea. You stink to an extent where everyone you know wants you dead and you ruin the Earth's Atmosphere, with your stinky fucking stench.

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.

someone who smells due to bad Body Odour or extreme case of Swass. It also could be someone who farts way to much and permanently smell like a big pile of steaming shit.