Top Definition
A female who shares the same birthday as you. You were born on the same day of the same year. You are not true siblings, but you share a significant bond
See Also Birthday Brother
Anna: Happy Birthday Robyn.
Robyn: Happy Birthday to you too, Birthday Sister
by Pablo2342 May 31, 2010
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.