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
opening a birthday card in hope of recieving a large amount of money, but all you get is a 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" What is the definition of "disappoint-day card"?