"18 Dummy" - Getting dumb by drinking Jose Cuervo 1800 Tequila, also known as "Dummy Juice." also, yellow (or "short") busses popularized by hyphy music (specifically Oakland artist Mistah F.A.B.) most commonly are equipped with 18 seats
"Flamboasting" - All manner of showing off.
"Ghostride the whip" - Driver walks alongside slow-rolling car with the door open, giving the appearance that the car is driving itself. Passengers ride with all the doors open and sometimes leap out of the moving cars, sometimes sitting atop the hood.
"Giggin'" - Dancing wildly
"Grapes" - The finest purple marijuana in the bay area.
"Hyphy train" - A wild, mobile party with a long line of cars with all the doors open, in which occupants ghost-ride, flambost, dance on the hood and roof, and otherwise get hyphy.
"Scrapers" - Vintage four-door American sedans with whistling pipes, oversize spinning rims and a powerful stereo system. They hang low in the back and send off sparks when one is "gas-brake dippin".
"Slapper/Slumper" - A song with particularly loud bass and/or Hyphy connotations.
"Stunna shades" - Oversized dark glasses that help accessorize the sagging jeans, white T-shirts and dreadlocks that are part of hyphy fashion. Unusual looking glasses that people wear when they go hyphy. "Stunnas" are frequently aviator style glasses, but often more elaborate or attention getting.