This is a term used in the place of the superstitious phrase "knock on wood" when one is traveling in a motor vehicle and no wood is around. One instead "knocks on car plastic" to affirm the superstition.

Someone who is possessed by clout chasing. The original human is now gone and a demonic entity that feeds on clout is all that is left. An empty shell with no control of their actions, forced to blindly react to situations they think will bring them attention.