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1.
The nickname of University of Chicago sports teams. It is a reference to "University of Chicago Athletics" being an oxymoron.

Maroon and Maroons became the University of Chicago’s official color and nickname, respectively, at a meeting of students and faculty on May 5, 1894.
The Oxymaroons have been living up to their name lately, unfortunately. It's nothing like the good old days with the Maroons who won the Big 10 in football in 1899, 1905*, 1907, 1908, 1913, 1922, and 1924.

*voted national champion
by Jebediah Steelsmith April 01, 2012
 
2.
To say two contradictory things to a person and then walk away from him/her.

In a word, to confuse the shit out of someone.
Person 1: Yo bro let's go to the movies tomorrow yesterday.

walks away...

Person 2: Wow that sonuvabitch just oxymarooned me.
by Pbiddyboy November 13, 2011
 
3.
The color of oxygenated blood; someone with more brain damage then your average oxymoron,3 misleading words together like post-war preview,or little big dwarf,ice- cold- hot- chocolate,anti-army-intelligence.
Damn Earl here I am bleedin` lak a stuck hog,but ain`t it a purty shade of oxymaroon?
by Vlad Dracu II December 04, 2003