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2.
The empty tin cans of butter cookies that are kept to store unrelated items, such as pencils and pens. Invariably opened with the expectation of cookies, the result is disappointment.
I thought there were some cookies left but it turned out to be a disappointment box.
by whathaveyou32 February 20, 2011
 
1.
n. A mailbox belonging to a college student (usually checked on a regular basis) which he or she normally finds empty, and thus a disappointment.
"Hey, hold on a sec, I've gotta check my disappointment box...yep, empty as usual."
by Joshua Winskill October 16, 2007