It is archaic in the US, A slang phrase coined by Thomas A. Dorgan. The phrase became popular in the U.S. in the 1920s, along with the bee's knees, the cat's whiskers (possibly from the use of these in radio crystal sets). In the 1920s the word cat was used as a term to describe the unconventional flappers from the jazz era. Personally I think it is quaint and up to you if you would like to use it.

Boni

---

"Be Hero to Yourself" -- Peter Tork