A contradiction in terms. Contrary to what some people will tell you, from Limerick to Florida, it does NOT mean a stupid ox. Derived instead from the Greek words oxy (sharp) and moros (dull).
Examples of oxymorons:

sunny night
military intelligence
compassionate conservative
ethical landlord
honest politician
open-minded altie
Christian Democrat
to appear invisible
deafening silence
friendly fire
charm offensive
civil war
by Fearman December 03, 2007

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Two words with disparate meanings, used together to form a nonsensical phrase.
Utah Jazz.

Military Intelligence.

Microsoft Code.
by Cap'n Bullmoose April 26, 2005

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A rhetorical figure in which incongruous or contradictory terms are combined. Americans are uncultured morons.
The suggestion from the intelligent american was met by a deafening silence.
Contradiction number one is a joke but not an oxymoron, number two is from the Oxford English Dictionary
by Stultus von Americana September 23, 2003

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The chemical product of a Trump supporter with the oxygen of reality.
Yesterday I doused Uncle Cletus in gas and set fire to him. He is now an oxymoron.
by Corbarian March 20, 2017

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An Oxymoron is a combination of contradictory words.
Oxymorons include
Asian-Italian
Cold Heat
Blind scout
Anything postive said with President Bush
by Fast Eddeh October 11, 2008

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Someone who regularly contradicts themself, and looks like an idiot (or, dare I say, a MORON) each time they do so.
"She said she that's not true..."
"What an OXYMORON! Just then she was saying it IS!"
by Jazzo July 07, 2005

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Two words that seemingly contradict each other when used together.
(20:38:05) amy: hey, i really am a good girl
by AciDz0r June 28, 2005

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A sequence of contradictory words
The posh bit of Leeds
by Zanthos April 13, 2005

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