From the Latin 'Mandemulus', meaning a collection of less than reputable characters.

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.

Man Dem is the term used for a group of friends or homies. This term originated from the carribean but found its way to the streets of the uk where it is widely used.

simply put, an alternative way of saying friend

Mandem like a plural of man.
a group of boys.

Definition is Jamaican/Patois slang meaning - "them men over there" literally, but is used to describe the men in society, can be used for random people/friends - mostly used for friends/acquaintances these days in London.

Like bruv, mate, friend (informal)