Top Definition
Statistics prove that you have one birthday, just one birthday every year. But there are three hundred and sixty-four unbirthdays. And this is a reason to gather and cheer.
by enken January 10, 2003
all the days besides your birthday in a year, referred to in Alice in Wonderland also
by saxaphoner September 20, 2009
the day of a sibling's birthday where you also receive presents/money in order to keep the peace.
Jamie: Did your brother have a nice birthday?
Alexandra: He enjoyed it, I also enjoyed my unbirthday.
Jamie: How much did you get?
Alexandra: £230 and an iPad.
Jamie: Tidy.
by shr3k April 17, 2011
the opposite of your birthday; the day of your future death
Without knowing, every year we pass our unbirthday.
by sphinxy April 23, 2016
When you acknowledge that it is, indeed, the date of your birth, but refuse to acknowledge that you have aged.
Even though it happens to be my eighteenth birthday today, I've decided not to become an adult.
by westindiangirl December 17, 2009
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