natal: of or relating to the place or time of one's birth. Your birthday is thus a natal occasion. Or your natal day, if you will.
But then also: natal: of or relating to the buttocks, as in the phrase (unfamiliar to me but rather clear all the same) natal cleft.
Apparently, at some point people had enough completely assy birthdays that the association stuck. That's probably how it happened, right?
Birthdays and bottoms have a long association. ;)
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