An Oxymoron is two words, or a compound word, with contradictory definitions. The most commonly-used example of an oxymoron is 'jumbo shrimp,' as a shrimp is small by definition and therefore cannot be jumbo.
More oxymorons:
Government ethics
Friendly fire
Pretty ugly United Nations
Hamburger
Urban Dictionary Holy war
McDonald's Big N' Tasty
Microsoft Works
Rap Music
Jumbo Shrimp
Plastic Glasses
Peace Force
Good Grief
Personal Computer Random Order
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Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.
After school, The Modells on Jamaica Ave was active. Respectfully.