Vehicle Borne Improvised Explosive Device - basically a car bomb used by the hajis in Iraq because they are cowardly pussies and know they don't stand a chance in a face to face battle. They rig up charges to old artillery rounds (122mm?), C4, or whatever. They can make it blow by using a cell phone to blow it. Or it can be command detonated but they are usually to big of a pussy to do that, too.
"Goddamn Haji has been working late tonight, we found another VBIED on route logroad"
"That VBIED just knocked the dust off that M1 sitting at the checkpoint"