There is a song from the movie Twilight that has a phrase "Fat House Cat" in it, this is who we think of when we hear it.
This is Peanut Butter, he is just about the fattest cat I've ever seen. He is so roly poly, I find him laying in these crazy positions all the time. At the time of this picture he was on the back of my love seat. I'm surprised he can even breath when he's on his back like this. That's Bentley on the floor, they are best buds. Bentley takes hold of Peanut Butter by the scruff of the neck and trys to shake him like a stuffed animal, but it doesn't work, Bentley weighs under 7 lbs, Peanut Butter weighs 16 lbs. He is the sweetest cat to put up with that little whipper snapper.