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English word gangbang comes from English gang, English bang
gang (English)
(intransitive, chiefly, UK, _, dialectal, Northern England, Scotland) To go; walk; proceed. (intransitive) To band together as a group or gang.. (transitive) to attach similar items together to form a larger unit. (US) A chain gang.. (US) A criminal group with a common cultural background and identifying features, often associated with a particular section of a city.. (electrics) A group of [...]
bang (English)
(ambitransitive) To hit hard.. (intransitive) To make sudden loud noises, and often repeatedly, especially by exploding or hitting something.. (slang, figuratively, ambitransitive) To engage in sexual intercourse.. (transitive) To cut squarely across, as the tail of a horse, or a person's forelock; to cut (the hair).. (with "in") To hammer or to hit anything hard. (in the plural) [...]
gangbang (English)
To beat one or a smaller amount of people as a gang.. To have sex with others in a gangbang. (US, slang) The act of a street gang attacking random people on the streets and/or committing gang crimes.. (vulgar) Gang rape.. (vulgar) Sexual intercourse involving more than two persons, especially with a high proportion of men.