Ninja Birthday

Definition

A humorous term for one's conception date (calculated by counting back nine months from your actual birthday)—the day you were made, not the day you were born. A joke based on the idea of sneaky, unobserved beginnings.

Example Usage

My birthday's in May, but my ninja birthday is actually in August when I was conceived.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Ninja%20Birthday&defid=4869627)

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