Hello All.  After further research and asking some "old folks," I do believe the "G" means Gramercy Park, because several older NYer's have told me that it was still a term when they were young.    "Up in G."      I was told by a 92 year old woman that "not only was the rich and famous up in G, but they had fancy fences around the gardens and Parks to keep the poor folks out."   Originally meaning Gramercy Park and referring to the "hoytie toytie's" who became more sophisticated and moved uptown to "Gramercy Park,"  it became a phrase for anyone who moved "up and out of the neighborhood"  and sometimes meaning "they think they're too good for us."   I am currently researching and writing a book about Old Manhattan and I truly appreciate this type of discussion, very colorful and thought provoking.  I would appreciate any one else who would mention old "sayings" "Colloquialism's" and "slang words" used exclusively in NEW YORK.  Thanks.