birthday twin

someone who has the same birthday as you.

whether it be same day, month or year.

Person 1: Hey man It's my birthday.
Person 2: Noway! It's mine too!

Person 1: Hey man, we're birthday twins!
Person 2: Cool man!

by ROCKGODFROMTHE60S November 18, 2015

Birthday twin pals

When two or more people, who are not twins in the traditional sense, share a birthday.

Chris, Tasha and Kara's husband all share the same birthday making them birthday twin pals. How freaky!

by Sallgoodman December 12, 2016

academic birthday twin

Somebody who shares the same birthday and doctoral supervisor as you.

Cian and Hieu are academic birthday twins.

by Gaillimheach October 25, 2017