A Johnson is a person who is always there observing, but never part of the action.
i.e:Tim sat there and observed the crazed antics of his buddies running around half naked yelling "YOLO!" and drenching random passerby with buckets of water. The teacher remarked: "Tim's such a Johnson."
by joshology July 22, 2014
When a guy ejaculates on a womans face
Hey did you give her an a. johnson?
by Ator February 01, 2006