The state of being equally adept at masterbating with both the right and left apendages (hands, or feet for those feeling adventurous!)
Mike was wanking with his right hand and got bored so decided to switch to his left hand, which felt great and he was equally adept with his left as with his right! Hence Mike can claim to be wankidextrous!
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.