Top Definition
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
Yeah but my catsister was meowing all night.
by Anna Lynn Sanders August 29, 2010

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