1 definition by shr3k

unbirthday

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