Reverse Birthday

A sex position in which the male re-creates his birth and rubs his head on a woman's clitoris.

I've got major chafing down there from John's hair when he did the reverse birthday on me yesterday.

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Reverse birthday present

Instead of giving a gift to someone on your birthday, you expect a present instead from them.

atareh: "Devon, I know it was YOUR birthday last week, but you should still get ME something. Think of it as a reverse birthday present"