A post sex change operation transvestite; usually refering to a female with a penis on various online image boards.
The term comes from viewing a pornographic photo of a girl and falling into a "trap," or realizing that she has a penis once the photo is fully loaded.
Anon1: Here's a pretty hot chick...
Anon2: omg she's a TRAP!!!
Anon1: I know.... fapfapfap
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