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1. Your parent's female cat. If your parents paid for it, its your catsister. If you paid for it, its your cat. If your sibling paid for it, its your niece-kitten. 2. A short, convienient way to say "The cat my parents adopted for me, but its still technically their cat because they paid for it. I call it my cat sometimes but my parents pay for all of her stuff. So shes like my sister except for the fact that she is a cat." 3. A wonderful compound word that is easy to understand even if you didn't look it up on urbandictionary. 4. Cat + sister = your sister thats also a cat. DUH RETARD SO OBVIOUS
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