A crossdresser, usually a fictional character in an anime, who dresses up in the opposite gender's clothing to trick people into thinking that they're the opposite gender. Term comes from the anime trope of a character dressing up in drag to trick people into thinking that they're the opposite gender.
Not to be confused with transgenderism, which is a person transitioning to the opposite gender.
Person A: That's a cute girl! What anime is she from?
Person B: It's actually a dude. He's a trap. He's from anime title