"Greenpointer” is the name of an inhabitant of Greenpoint, in the borough of Brooklyn. The name “Greenpointer” has been cited in print since at least 1867.
Wikipedia: Greenpoint, Brooklyn
Greenpoint is the northernmost middle class neighborhood in the New York City borough of Brooklyn. It is bordered on the southwest by Williamsburg at the Bushwick inlet, on the southeast by the Brooklyn-Queens Expressway and East Williamsburg, on the north by Newtown Creek and Long Island City, Queens at the Pulaski Bridge, and on the west by the East River. Originally farmland (many of the farm owners’ family names, e.g., Meserole and Calyer, still name the streets), the residential core of Greenpoint was built on parcels divided during the 19th century, with rope factories and lumber yards lining the East River to the west, while the northeastern section along the Newtown Creek through East Williamsburg became an industrial maritime reach. There has been an effort to reclaim not only the rezoned Greenpoint/Williamsburg East River waterfront for recreational use, but to extend that effort to include a continuous promenade into the Newtown Creek area. The neighborhood is part of New York’s 12th congressional district, State Senate Districts 17 and 25, State Assembly District 50, City Council District 33, and Brooklyn Community Board 1. The neighborhood is served by the NYPD’s 94th Precinct.
His Views and Experiences
New York, NY: G. W. Carleton & Co., Publishers
Got half way, and met another car from Greenpoint.
The Greenpointers wanted us to go out again.
Our driver got his back up, and said he would see Greenpoint in — Williamsburgh first.
10 September 1868, New York (NY) Herald, “Oriental of Greenpoint vs. Oriental of New York,” pg. 8, col. 5:
The game between these clubs yesterday for the name and ball resulted, after a finely played game, in the defeat of the Greenpointers.
1 April 1896, New York (NY) Times, “Mayor Gleason Will Enforce the Law”:
LONG ISLAND CITY, L.I., March 31.—Until the Raines law is declared unconstitutional, Mayor Gleason says, it shall be enforced, Free lunches are to go, and next Sunday will be “dry.” This will be a source of inconvenience to Greenpointers, who flocked here in great numbers last Sunday.
24 April 1918, New York (NY) Times, “From North to East”:
To the Williamsburgers and Greenpolnters; also, the new situation of the Sound boat.piers, ...
By Quentin Reynolds
By Quentin James Reynolds
New York, NY: McGraw-Hill
The Flatbusher has difficulty following the speech of the Greenpointer, the native of Brownsville has about as much in common with the Park Sloper as he would have with someone from Fort Worth, Texas.
New York (NY) Times
On Facebook, Neighborhoods as They Once Were
By JED LIPINSKI
Published: September 30, 2011
Other pages seem to have been formed in solidarity against a wave of new residents. “For all the true Greenpointers born and raised,” reads the description of “Greenpoint Natives,” a page established in March 2010 that now has 1,563 members. “Too many blogs and pages out there for the ‘new’ Greenpointers,” it explains.
The Brooklyn Paper
March 29, 2013
Bar back: Greenpoint’s Coco66 reopens after NYPD raid
BY DANIELLE FURFARO
So Greenpointers say they will keep a close eye on the newly resurrected nightlife spot.