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The act of engaging in anal sex during one's birthday is referred to as birthdanal (shortened from birthday-anal)

It is often thought of as a gift or favour from one's partner, something that they are only willing to do because it is the partner's birthday.

Care should be taken during birthdanal to avoid contracting birthdAIDS.
My girlfriend agreed to birthdanal.
by ItsAadam July 22, 2011
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The act of performing anal on your birthday, giving or receiving.
"I'm going to see Phoebe tonight and for my gift I'm gonna get to do birthdanal with her"
by NotJoab May 19, 2018
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