Updated: JANUARY 19, 2017
Dong is a slang term for penis.
It may also refer to a long, phallic shaped sex toy used for masturbation or simultaneous penetration of two people.
More About Dong
The term dong is also used, like other genitalia slang terms, to describe the negative behavior or character of an individual.
More generally, it can refer non specifically to a dildo, but may also refer to a specialized type of dildo that has two smooth ends and is used for simultaneous penetration.