Top Definition
The holiday celebrated by atheists while others celebrate Christmas or Chanukah.
"For the last few years I've been feeling a little awkward about wishing my boyfriend, an atheist, a Merry Christmas. So, this year I'm gonna try out 'Have an Indifferent Atheostica' & see how that feels."
by ProgPrincess November 29, 2009
5 Words related to Atheostica

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