You found it. It's the sound of a CAT
being run over by a lawn mower.
The Big Bang Theory Season 2, Episode 15
She doesn't have a CAT, she has a Mexican
hairless. Annoying little animal. Yip-yip-yip.
The Big Bang Theory Season 1, Episode 17
...with a genetically altered CAT?
The Big Bang Theory Season 1, Episode 3
but he loved Cat very much.
Game of Thrones Season 7, Episode 2
I learned that for free
from a CAT poster, but good for you.
The Big Bang Theory Season 9, Episode 12