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1.
An adjective used by hipsters of the 1920's to describe a person who is the best at what they do.
Also used to describe another person who is genial and fun to be with.
This term has been recently popularized by the movie 'The School of Rock'.
Synonym: bees-knees
"Martin sure knows how to dance, he's the cats pajamas, man!"
by Mitch May 31, 2004
 
2.
1920s Lingo describing someone (something) who is great, incredible or special. Usually indicating stylishness or innovation. Pajamas were a relatively new fashion in the 1920s. The term "cat" was beginning to be used as a term to describe the out going and unconventional jazz-age flappers.
That girl wearing those Paris Hilton sunglasses must think she's the cats pajamas.
Those crazy rinestone studded platinum teeth are the cat's pajamas!
by Thomas the Bombest May 10, 2007
 
3.
Super hip. Amazingly sweet. Fantastically cool.
you looks so fly in that outfit, you're the cat's pajamas man.
by where am i? November 10, 2005
 
4.
The term "cat's pajamas" comes from E.B. Katz, an English tailor of the late 1700's and early 1800's, who made the finest silk pajamas for royalty and other wealth patrons. This phrase is often likened to and/or confused with the 20's term "cat's meow".
Katz's pajamas are the cat's pajamas.
by skulldugger November 21, 2007
 
5.
Slang Used in the 20’s, this expression is very similar to "cool."

Also the name of my kitty rescue. Save the homeless kitties. Adopt now!
The Cat's Pajamas is a No-Kill rescue!
by cantgoback</3 January 06, 2013
 
6.
Awesome, very good. Apparently coined back in the 1920's, but it is still in use today.
Spike: I don't believe it! After a huge setback, Applejack is back at the front of the pack!

Pinkie Pie: She's the head of the pack, all right. The pick of the litter! The CAT'S PAJAMA'S! Oh, wait! Why would Applejack take some poor kitty's PJ's? That's not very sporting of her.
by Anonymous Brony October 21, 2011
 
7.
Traditionally followed by the phrase, Whole darn department store
"Ain't I the Cat's Pajamas?"
"You're the whole darn department store!"
by T to the V December 24, 2006