"To demote or devalue someone or something, as happened to the former planet Pluto when the General Assembly of the International Astronomical Union decided Pluto no longer met its definition of a planet."

Does not inherently note whether the demotion was with or without cause. This is the definition provided by the American Dialect Society, who coined the word.
The US dollar has plutoed in recent years.
by RadSavage August 20, 2009
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Verb. to pluto someone or something is to downgrade, demote or remove altogether from a prestigious group or list, Like what was done to the planet of the same name.
by Yoova August 24, 2006
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No longer a planet. It was discovered in the 1930s and in 2006 they finally decide to change everything we learned growing up...im so confused now...
wtf! everything i learned went out the window, pluto isn't a planet anymore.
by Dr.Mario August 24, 2006
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A beautiful young lady with Affable personality. She is Ambitious and has trust in her own abilities and knows that she has value. Pluto is a girl given name which means bold or expressive eyes!
Hey Pluto, how are you doing today?
by _trablu3 February 5, 2021
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1. A loner reject planet that the solar system kicked out
2. Mickey Mouse's awesome dog
3. Your mum.
Sarah: I kinda feel sorry for Pluto, you know?
Bianca: What? The planet or the dog or what?
Sarah: the planet, DER.
by YOURMUMRATESME February 21, 2010
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a poor little rock thingy in space that was tricked into thinking it was a planet, when... wham! some mean scientists told it the truth: it was a "dwarf planet" (which is some sick disorder that tiny planets are labeled with). i feel bad for the little guy.
"It's okay, Pluto. I'm not a planet either."- Snorg Tees
by Spyder Gurl August 24, 2008
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a big ball of methane and nitrogen that was big ballin' as a planet for about 80 years, until the IAU (International Astronomical Union) decided to get all technical and make that little bitch a "dwarf planet." At this point, it's a pretty safe bet that Pluto won't be getting laid anytime soon.
Pluto used to get invited to P Diddy parties back when he was part of the big 9, but now he can't even kick it with Polly Shore. What a a tool!
by MC Docky Dock August 24, 2006
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