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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
two words paired together which have conflicting meanings; two words whose meanings are so different that pairing them together results in an impossible combination.
Oxymorons include but are not limited to:

Fox News
United States
same difference
new moon
smart girl
Church of Scientology
by this be my fucking name bisch November 01, 2009
2 words that contradict each other like its so wonderfuly painful
the greatest oxymoron my teacher tought us was quiet women
by some person in some world April 01, 2009
A person who abuses the prescription painkiller OxyContin, also known as hillbilly heroin. A truly moronic oxymoron refers to OxyContin incorrectly as "oxycotton".
That oxymoron Jeff overdosed on OxyContin at a rave.
by Led Zeppole November 19, 2003
A stupid person with bad skin problems.
Poor Norman he has the intelligence of an amoeba and a face only a mother could love.
...yeah poor Norm, he's an Oxymoron.
by sunshiyong October 25, 2010
Someone who actually believes Oxyclean works.
Joe- "That Billy Mays, such an oxymoron,"

Jeff- "May he rest in peace,"
by CrazyOxy October 04, 2009
A habitual user of Oxycodone whose continuted use has diminished their intellect to that of an idiot or moron.
Damn, Martinique your brother sure is an oxymoron." "Well what do you expect? He smokes them thangs like Newports!
by Professor Von Slice Five October 29, 2010
Rush Limbaugh. Two words that don't agree with each other:Rush and OxyContin.
Someone whose moronic behavior(i.e.meglomania) leads them to a self-destructive act or acts. Someone in the pursuit of a drug that is known to be addictive like morphine,OxyContin, is an oxymoron.
by The Green Gnome October 08, 2010