cat nerd 

Basically someone who is an expert at everything you need to know about cats

Kevin thought his sister Victoria was a cat nerd bc he was being a retard

cat nerd by Einsteins half brother August 23, 2019

cat nerdy 

Nerdiness defined by an obsessive love for cats. Can apply to other animals as well, such as penguins.

She used to be cat nerdy, now she's a flat-out crazy cat lady.

cat nerdy by crosley September 20, 2012