A car which drug dealers borrow from the (usually rich) buyer for a few hours on acount of the credit for the drug. It stands for "Gram-car" (the owner of the car "buys" one gram of crack and pays for it lending his/her luxury car to the dealer for a while, instead of giving cash money).
The dealer had been seen in a white Lexus. It turned out to be a G-car.
by zhora August 14, 2007