Top definition
Originally used as a birthday that does not go very well, later bastardized into any unfortunate happenstance
Birthday Boy: Oh a surprise party? Awesome! thanks guys! ....Wait a minute...there are only 2 balloons? that's it, I'm leaving...SAD BIRTHDAY!

or

Jazzy: Man, It's 3 AM and I still have a lot of homework to do...I guess I have to pull an all-nighter...
V.M: Saaaaad Birthday
by Danny-Matt October 05, 2009
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