The jet black Night Fury dragon that appeared alongside main protagonist Hiccup as the deuteragonist in the 2010 movie "How To Train Your Dragon". He is initially aggressive towards Hiccup but becomes friends with him after Hiccup helps Toothless become airborne again, after Toothless' left tail fin was ripped off when Hiccup shot him down.

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.

A species of fire breathing dragons with black, sleek scales. This reptile is deemed to be dangerous and deadly, however when befreinded, the dragon will become a sort of guardian. The name "toothless" derives from the dragon's mouth which looks like it has the absense of teeth; but in times of danger, the dragon's vicious teeth are exposed.

The species was featured in the recent film, "How to Train your Dragon"

somebody who's sleezy or unbelievably sneaky

When your ass let’s out a wet fart

To not have your real original teeth in your mouth