A person,thing or event to be held in high regard. From the meticulous treatment and devotional attention a feline bestowes on its hindquarters. Not in wide useage.
You look that good and can cook too? Damn if you ain't about the cats ass!
From the chopsui movie "drunken master". In the context of the movie to mean "your the best thing since sliced bread". See Bees Knees and Dogs Bollocks
Salvidor: "Hey guys I just bought over a case of beers"
Friend: "Gee Salvidor, you're the cat's ass"
When someone is grumpy and the screw up their lipsreally tightly so that their lips look like a cats ass. If they try to smile they can look like a scary cats ass with teeth.