G6 / G650
Slang for the Gulfstream G650, a twin-engine jet airplane manufactured by Gulfstream Aerospace.
The estimated pricetag exceeds $58 million USD, and will be assembled in Gulfstream's new manufacturing facility in Savannah, Georgia. Gulfstream begins taking orders for the aircraft in April, 2010, with delivery beginning in 2012.
"I am feelin' so fly like a G6".
h/t Urban Dictionary