The Gulfstream G500 business jet. With its two Rolls-Royce BR710 engines, this thing can fly from LA to Moscow without refueling.

G-5 refers to, and is short for, the Gulfstream 500, which is a private jet aircraft. (from Jesse McCartney song Leavin')

A type of dance that involves bending of the knees and Tpain.

G-5 is a plane that is very nice

Type of dance popularized by music artist T-Pain where one imitates the G5 Jet by having their arms out on their sides. Often demonstrated after one bends their knees getting low while dancing at a club. May have derived from the "Hyphy" movement of the Bay Area and if not, has been adopted by the movement.

Dance created by T-Pain.
You put your arms at like a 90 degree angle, spread your legs and rock back and forth. You can see this is the music video Pop Lock and Drop it by Huey, and probably some others.

not as fly as a G6