Trap

Description of a fictional character, that was written by the writer to deceive people into thinking that they are the opposite gender.
Entirely used in order to deceive people.

Depending on the trap, it is also a femboy, but you don't know that until later. Purposefully. Due to the author.

Not characteristic nor having any relation towards peoples of the transgender community.

Jon A: Traps are totally gay
Jon B: That stopped mattering a LONG time ago
Jon C: Reverse traps or just traps?
Jon D: Hey, that's offensive
Jons A, B, C: We're talking about *anime*
Jon D: Ooooh nevermind