Top Definition
Opening a birthday card in hope of recieving a large amount of money, but all you get is a birthday card.
Disappoint-day card = Disappointing birthday card
Boy 1: Dude, did you get the $60 from your grandparents for that new game in your birthday card?

Birthday boy: No, all i got was a disappoint-day card.
by Dcom001 April 30, 2011

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