Tighter than a Cat's Ass 

Intensely tight to the point that entry seems impossible

"Due to the visit of a foreign dignitary, the police had the city locked down tighter than a Cat's ass!

Tighter than a Cat's Ass by Mr. Jameson September 14, 2010

The Cat's Ass 

Being genrally awesome, something that is really, really sweet.

there are also varitions such as The Cat's Meow

person A: "Hey man look at this sweet new game"

person B: "WOW! that's the cat's ass!"

The Cat's Ass by FathaFunka July 4, 2010

cat's ass 

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"

cat's ass by Bumkicker Slade April 24, 2005

cat's ass 

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"

cat's ass by RT July 19, 2004

cat's ass 

Something that's incredibly cool.

Man J.D. is the cat's ass

cat's ass by AWe_Some October 8, 2010

Cat's ass fever

When someone gets off licking cat asshole

Bob: Where is Rick going with that cat?

Tim: He's got cat's ass fever

Bob: That sick bastard!

Cat's ass fever by Ajax0013 January 7, 2012

The Cat's Ass 

Shouted in moments that often define a great joy or something spectacular in nature.Thought to be awkwardly Canadian in origin, circa 1960s Manitoba Province, this phrase was recently brought back to life in the Midwest United States of America. As of 2018, variations of the word have been heard as far south as Memphis, Tennessee.

My hotel has a bidet! That's the cat's ass! I've never felt so fresh so clean. I am going to purchase one upon my return home.

The Cat's Ass by Bidet Dave September 6, 2018