To demean another to make them feel as though they don't amount to anything. As the scientists did to Pluto.
It's okay Pluto, I'm not a planet either.
Dude this guy hit on my girlfriend so me and my friends just plutoed him for the next hour.
by bye byeee August 11, 2008
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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.
1) Pluto sure is far away...

2) Micky Mouse's dog is Pluto.
by Sirius123 May 08, 2007
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noun: meaning "demotion"; related to the verb "plutoed" which means "demoted".
His performance was way down, but he didn't get demoted, I think he barely dodged a pluto.
by ScalRonnie September 04, 2007
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The only planet in our Solar System.
Promoted for being gargantuan compared to the other worthless rocks.
Person 1: Hey, you hear about Pluto's promotion?
Person 2: Yeah, isn't Pluto just the best thing to happen to this universe?
by asspenis7 November 02, 2019
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An excuse for a whole bunch of astronomers to argue a lot and author new or updated books about Astronomy.
Q: How many planets are there?

A1: This week, last week, or next week?

A2: Nine; we've known that for years. No, other Pluto-like objects are planets too, so there are twelve. No, Pluto-like objects are not planets, so there are only eight.

Afterthought: Mercury isn't much bigger; can't we disqualify it too?
by Downstrike September 12, 2006
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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
bob used to be CEO for that company for 5 years but now he is foreman.man he got pluto'd
by amitima August 25, 2006
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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.
I can't stand Pluto people. You know, those types that create more problems than they solve.

He's more Pluto than Pluto!

by Hack The Matrix January 09, 2008
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