gas-brake dipping
n.— «One popular example of kids acting hyphy or “going dumb” is “gas-brake dippin’.” In the Bay, they pile into their cars and, instead of driving normally, they’ll hit the gas, then quickly hit the brake; hit the gas, hit the brake; hit the gas, hit the brake. And when they really want to get into it, they open all the doors on the vehicle, turn the music to its loudest possible volume and…You guessed it: Hit the gas, hit the brake.» —“Hyphy: Crunk, Northern-California Style” by Shaheem Reid MTVNews.com Nov. 8, 2004. (source: Double-Tongued Dictionary)