A term used in the anime community to describe the character archetype of male characters who dress and present themselves as women (not to be confused with transgenderism), a good example would be Chihiro Fujisaki from Danganronpa.
However, it should be noted that people in the LGBT community have criticized the word as people started using the term as a slur against trans women, along with it's relation to the gay/trans panic defense legal strategy.
Instead, you should try using the Japanese term "otokonoko" when talking about these characters.
"Man, I was watching this anime and there was this really cute girl character, but it turned out they were a trap and now I'm questioning my sexuality."
person 1: "watch out for that trap!!!"
person 2: *steps forward* "ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh!!!!!!!!!!!"
perason 1: "oh damn, he dead"
An outdated term in the western anime community that use to refer to male characters with strikingly feminine characteristics, either through natural andronicity or strikingly convincing crossdressing and expresses with feminine mannerisms, either as a self indulging act or accidental second nature.
The term was originally used because westerners weren't use to Japan's crossdressing subculture boom in the early 2000s, resulting in many characters striking the viewer's fancy by accident.
Modern terms are tomgirl, crossdressers or, for a broader cultured umbrellas, otokonoko.
Bridget became popular with both men and women, who both attempted to cosplay as him. As a result, this gave birth to traps that we know today.
That girl you sent a dick pic to and she sent one back
person: Yo I was home with this girl and showed her my dick
person 2: What happened after that?
person: She showed me hers
person 2: Oh no a trap
Someone who uses their sexuality, gender, or race to try and get people in trouble or make others look down on them.
Joey: "Hannah can you please stop talking for a minute"
Hannah: "Is it because I am a Person of color"
Joey: "No what the fuck you on about"
Hannah: "Oh so you are saying its because I am trans"
Joey: "Stfu you trap"
Trap is a noun and a adjective. As a adjective like when a person is fine and normal but secretly a demon from the inside. As a noun like when a person had a strange personalit, act, and backstory. Just look back how they act
Noun
"Is this person acting like a trap?"
Adjective
"Careful, he's trap. So don't talk to him."
When a female send nudes
"Damn Selena sent traps the first week"