EMF does NOT stand for Electromagnetic Field. It stands for Electro Motive Force. And whether or not the forces and fields created in keeping a car battery charged are powerful enough to cause physical injury is up for debate. Surely there is considerable dielectric material between his butt and the charging paraphernalia. The battery is actually farther back to the rear of the car. JMHO.
Can mean either. (And many other things) Just Like BLM can stand for Bureau of Land Management or Black Lives Matter .