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
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
Pimps like us taking over/pluto the sense of being from the pimp planet. real nigga's took name pluto and made it into our own
the girl asked me where i was from i told her im from p.l.u.t.o.
by irwinstotler February 02, 2009
To be in a state of smoking so much Marijuana, that one either falls asleep or is intoxicated to the point of almost incoherence. Origins in Longmeadow, Massachusetts and is a play off of Normandy (see Normandy).
"He was past Normandy man, he was on Pluto..."
by communism117 February 22, 2008
Plutos are the growing number of pluto (yes, the planet) sympathizers post-rejection from the IAU. These include people who grew up thinking Pluto was a planet and don't think it's fair to pick on the smallest planet in the system. Plutos mourn their loss together mostly over the internet in online forums like Facebook.
"Man, those Plutos on Facebook are right! I miss Pluto too!"
by Marvin the Martian January 17, 2007
Plutos are the growing number of pluto (yes, the planet) sympathizers post-rejection from the IAU. These include people who grew up thinking Pluto was a planet and don't think it's fair to pick on the smallest planet in the system. Plutos mourn their loss together mostly over the internet in online forums.
"Man, those Plutos are right, I miss Pluto too!"
by Marvin the Martianette January 19, 2007
not a planet thats for damn sure
Randy: Did you hear about thar planet pluto
Me: Nope!
by econs May 11, 2010
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