[*The Concise New Partridge Dictionary of Slang and Unconventional English*][1] (2008) says:

> **Gucci** *adjective* stylish, especially cleverly so. From the high-profile fashion brand *UK, 1995*


  [1]: http://books.google.fi/books?id=cCVnlIUTpg4C&pg=PA311&lpg=PA311&dq=gucci%20slang%20partridge&source=bl&ots=cRQwPVNUfv&sig=IBi9Z_w2SgChNIAB4s5JHlfjsLI&hl=en&sa=X&ei=S8FxUaSUDcaE4ATj-YDwBQ&ved=0CEEQ6AEwAA#v=onepage&q=gucci%20slang%20partridge&f=false