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6.
the best, the bomb
Have you heard the Jason Mraz CD yet? It's the cat's ass!
de your mom 7 septembre 2003
 
1.
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!
de numerator 29 avril 2005
 
2.
The very best. The finest. The epitome. Most excellent. Boss. Zorch cow. Real George.

This cat's ass expression was common in the early 1960s.
Whoa, where did you get that piano? It's cat's ass!

During a Vince Guaraldi concert in Berkeley in 1961, a dreamy beatnik kept mumbling "Cat's ass, man, cat's ass"
de Bumkicker Slade 24 avril 2005
 
3.
absolutley, without a doubt, for sure, unbeatable, "can't be licked"
"That brand of whiskey is the cat's ass"
or
"I'll drink this whole bottle of whiskey, cat's ass"
de RT 19 juillet 2004
 
4.
An exclamation of sublime excellence.

Of Canadian origin, thought to be a crude derivative of the more common and acceptable expression, tits.
This is cats ass, man.
You're the cats ass.
de Diane 26 novembre 2003
 
5.
When something is beyond words to express with the english language. To express extreme awe with some action, someone or something.
That movie was the cats ass !!!

Dinner, was the cat's ass tonight.

de Mark in Calgary 14 mars 2009
 
7.
In reference to something more excellent than a cat's meow
Well, ain't that the cat's ass?
de sarahisthecatsass 12 décembre 2006