Super hip. Amazingly sweet. Fantastically cool.

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".

Traditionally followed by the phrase, Whole darn department store

Used to describe something that is interesting and confusing. Often used in sarcasm.

its a cheesy and kind of old way of something is cool

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

(adjective) term used to describe a person or object in a postive manner. similar to "the bomb" or "the shit", means the object in question is cool.