'banger' originates from English, specifically the word 'bang' with the agent suffix '-er', meaning 'one or something that bangs' (i.e., makes a loud noise).

'banger' originally referred to anything that made a loud bang; by the late 19th / early 20th century it was applied to objects like fireworks and noisy devices, later extending metaphorically to items such as sausages (reportedly because they could burst or 'bang' when cooked) and to old cars (which made loud bangs). The musical slang sense ('a great song') is a more recent figurative development.

Initially it meant 'something that makes a loud noise', but over time it evolved into specialized senses including 'sausage', 'old car', 'firework', and (more recently) 'a very good, high-energy song'.