Johnson Maneuver means in slang: If someone is driving in front of you and they are threatening to kill you, it’s usually a woman of certain age. You and the passengers may be nearly paralysed by “Johnson”. Even better, you can get the person stopped at a red light to get out of their car. Then, you can slap some junk on his windshield and complete the Johnson Maneuver. (in Slang Dictionary, added by Lillian Hodge)