Where a man says he's going to bust a fat nut but his... "yield", is crusty ass dust that blows away in the faint wind of any enclosed area. Significantly disappointing his receiver.
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
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).