When you're going down on a girl and realize she has something extra left over down there- tiny bits of toilet paper, clumps of discharge, cottage cheese from her yeast infection, etc.
Dude it was so nasty, I was going down on Kristy last night and ate some of her kitty chow!
Along the same lines as cutie-pie or sweetie-pie, meaning CUTE+SWEET as PIE. Cat lovers began the "meow" movement, meaning they like something or are being sweet and or cute when they meow. So KITTY-PIE is how cute something or someone is, in "meow speak".😻