car hopping
n.— «In fact, they said the act is commonly known to them as car hopping. The act itself involves people looking to break into cars, going from one car to another and looking for one that’s unlocked, then stealing what they can find inside.» —“Good Question: What’s with the lingo?” WBBH-TV (Fort Myers, Florida) Oct. 11, 2007. (source: Double-Tongued Dictionary)
In California, car hopping is when you have a hydaulic or airbag system in your car and you actually make your car bounce up and down.