Green’s Dictionary of Slang

nadgers n.

testicles.

2000

N. Griffiths Grits 286: Runnin through Prenton in the nuddy with hatpins through me nadgers.

In phrases

put the nadgers on (v.)

to jinx, to cause trouble for, to ‘hex’.

1984

Partridge DSUE (8th edn) 775/1: [...] perhaps orig. RAF, early 1940s; in the 1950s given much wider currency by the radio comedy series ‘The Goon Show’.