Having the balls to sag more than most people with and having a gait that complement the walk and the talk. It's similar to up tight like an asshole but also the complete opposite while promoting an aura of freedom. Also can be spelled sagasscity and is pronounced sag-ass-sit-E

The closest antonym is conservative if you mix it with wedgy. But sagacity also hints at bravery and having the balls and/or guts to be yourself and stand out.

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.

How saggy one's tits are.
This can be judged on a scale of 1 to 10.