Noun: The day to celebrate one's half birthday. If on your birthday you receive cake, on your half birthday you should receive a cupcake.
Person One: Today my son turns 2-1/2 years old.
Peron Two: Yay that's his Cupcake Birthday!
When a girl totally makes a wish that the dude won't cum on her ass and he still does.
Cindy hated the texture and taste of Tom's jizz and even though she didn't want it he still jacked his sweet frosting all over her buttocks and "voila" Birthday Cupcake.
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