Trannyformer
Similar to a Transformer; A Trannyformer is a male or female that is in the process of getting a sex change or appears to be the opposite gender of when he/she was born. They can appear different by changing clothes, makeup, speech etc.
Mike: Hey Peter, I saw a transvestite at the mall today!
Peter: No Mike, you saw a Trannyformer.
Peter: No Mike, you saw a Trannyformer.