A runner is a 13 year old Virgin who has a big nose and has got a band of 14-19 year old followers who support him everyday and support everything he does also known as beta nonces
A person pretending to be something they aren't, or an impostor. This is inferred because of the old alien movies where alien pods appear on earth and the "pod people" dispose of the humans and slowly reproduce the bodies, pretending to be humans.
The pod person was pretending to be my father, but I knew that he was an alien when he acted differently than my father ever would have.