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1.
To answer a question without wanting to give any background information usually due to shame. Also used when you know the complete answer is extremely unexciting.
Ryan- Hey Brad did you sleep with that chick last night?
Brad-Short answer? Yes
Ryan- Long answer?
Brad-Yes.. and she turned out to be a "he" so lets drop it ok...

How was the movie last night?
Short answer? It sucked.
by Paskeet September 13, 2009
 
2.
Any answer that is not multiple choice, matching, or an essay.
a. Matt is a "dumbass," where the word in parentheses is the short-answer
b. solve: 2x=4, "x=2" where the word in parentheses is the short-answer
by Matt "The Dumbass" Mounts October 06, 2008