1) an unreliable New York City subway line that is the underground transportation equivalent of the BQE (Brooklyn-Queens Expressway), as it does not enter Manhattan at all.
2) also known as the GG (or double G) in the 80's because if you rode this line, you were as good as gone.
3) connects to the L-train at the Metropolitan (G)/Lorimer (L) stop.
Unconfirmed reports of its existence lie from the uterus of Queens to the ballsac of Brooklyn.
Slang: Fucking G train
"This is Lorimer Street Station. Transfer downstairs to the Fucking G. Stand clear of the closing doors."