bang adverb, US 1:bang goes Indicating that something is spoiled, ruined or lost. (1868 —) . T.E.Lawrence I am afraid I have to drive from here to Urfa (Edessa) which is going to cost me about £7: so bang goes my proposed purchases in Damascus (1909). 2:bang to rights of a criminal: (caught) red-handed. Also banged to rights. (1904 —) . F.Norman One night a screw looked through his spy hole and captured him bang to rights (1958). 3:bang on Precise, exact. (1936 —) . Spectator As a realistic tale of low life in London, it is bang on (1958).noun 4: Excitement, pleasure; a 'kick'. (1931 —) . J.D.Salinger I hate the movies like poison, but I get a bang imitating them (1951). 5: An act of sexual intercourse. (1937 —) . J.Updike I bet she even gives him a bang now and then (1968).verb trans. and intr. 6: To have sexual intercourse (with). (1937 —) . J.Kerouac He rushes from Marylou to Camille...and bangs her once (1957). 7:to bang on Used to denote insistent or repetitious talk about a particular subject. Car So if you bang on now about how wonderful these cars were, don't be surprised by the odd hollow laugh from your more mature patrons (1990).
bang noun, US
Cannabis. Also, a 'shot' (of cocaine, etc.). (1929 —) . K.Orvis He...talked me into sampling a bang (1962).
[Variant of bhang cannabis, often treated as if a slang sense of bang1noun.]