The art of slapping one's index finger against conjoined thumb and middle finger in a repeated fasion to show excitement. Popular motion by tobacco chewers to push tobacco to one side of the tin, but perfected by those with no other way to contain themselves.
This is my jam!!!....Glap...Glap...Glap
YEAH!.......... BOI!!!!.......Glap....Glap...Glap
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.