Also found in: Dictionary, Thesaurus, Financial, Idioms, Wikipedia.
Related to smoking gun: TMZ
smoking gunDrug slang
A regional street term for heroin and cocaine.
A metaphor referring to the definitive confirmation of a cause-and-effect relationship.
A term for an object or fact that provides conclusive evidence linking a perpetrator to crime or criminal act, the premise being that if the gun used to injure or kill someone is still smoking (or recently discharged) and on the person accused of firing the weapon, that person almost certainly committed the crime.