Green’s Dictionary of Slang

bangers n.

[bang v.1 (1), i.e. they bang together]

(Irish) the testicles.

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[Ire](con. 1930s) L. Redmond Emerald Square 197: An’ I got this honest, burstin’ me bangers up in the brickworks. [Ibid.] 199: For gas I looked up ‘testicles’. ‘Male reproductive glands’ it said. So now I knew. Your bangers!