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!

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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!

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

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