1) The planet farthest from the sun that we know of. Recently reclassified as a "Dwarf-Planet".

2) The dog that is owned by that down-syndrome mouse, Micky.

noun: meaning "demotion"; related to the verb "plutoed" which means "demoted".

The only planet in our Solar System.
Promoted for being gargantuan compared to the other worthless rocks.

A pluto is a person who is small yet everyone cares about them because they're so important and wonderful whether or not they're apart of something.

An excuse for a whole bunch of astronomers to argue a lot and author new or updated books about Astronomy.

a planet that aint a planet no more in laymens terms. we just sent a probe there thats gonna reach in 2015 and it has 3 moons charon nix and hydra.it was demoted on august 24 2006 at like 8:00 am i think

oh and its also the dog in disney

Stupid, ignorant, in the dark, not having a clue as to what's going on in the world, etc...The term derives from the fact that knowledge is often equated with light for it allows us to "see." The sun is the ultimate source of light and thus the ultimate symbol for knowledge. Anything far from it would by default be something that is also "far" from a source of knowledge in the way that Pluto is far from the sun. There's also the fact that Mickey Mouse's dog Pluto is an idiot.