An excuse for just about anything, basically means "I can do it, but not now".

Ideally to be in recovery mode means that one can't perform an action because they have already done it recently and are still "recovering" from it. Thought to be derived from the term people sometimes use to describe their state after an intense workout when they are supposedly weaker from straining themselves and can justify dismissing a challenge. Because "recovery mode" allows someone to excuse themselves from doing something and make it seem like this was because they do it so much, it is often used by egotistical smartasses and cocky jocks. However it can also be used in a completely irrelevant way, often to great comedic effect.

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.

After taking a big poo, you find yourself unable or find it uncomfortable to perform simple tasks e.g. walking, sitting, running, moving of any kind.
It usually goes away with time but to speed things up you must stand up straight and then relax your anus muscles and you will exit recovery mode.