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"
While playing tennis, the girl felt a crisp wind move her shot in-bounds and she knew Toothless, her guardian was in her presence.
by kridwid September 27, 2010
somebody who's sleezy or unbelievably sneaky
that girl is toothless
by S Stizzle February 24, 2008

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