flat cat 

A cat in a hoader's home that has " been lost" or "run away". Essentially the cat has died due to lack of care or unlivable environment and has become compressed by the hoard. Related to a sail cat.

Is that a flat cat under those books?

flat cat by Terriblepeopleperson June 19, 2017

flat cat 

A flat or small vagina. Usually used to describe a vaginal area.

“that girl has a flat cat.”

flat cat by bossfam April 3, 2019