A machine or other device designed to catch (and sometimes kill) animals, either by holding them in a container, or by catching hold of part of the body.
A bend, sag, or other device in a waste-pipe arranged so that the liquid contents form a seal which prevents the escape of noxious gases, but permits the flow of liquids.
A vehicle, residential building, or sidewalk corner where drugs are manufactured, packaged, or sold. (Also used attributively to describe things which are used for the sale of drugs, e.g. "a trap phone", "a trap car".)
A fictional character from anime, or related media, who is coded as or has qualities typically associated with a gender other than the character's ostensible gender; otokonoko.