Top Definition
Caterday, the greatest days of all days. Follows Furry Friday. Commonly celebrated on 4chan's /b/ board, and referred to as the only thing that /b/tards hold sacred (also, usually mentioned as one of the few things on /b/ that isn't entirely NSFW).
It's caterday! Post some fucking cats!
by Nilorom July 15, 2006

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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