Bollocks

google

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mid 18th century: plural of bollock, variant of earlier ballock, of Germanic origin; related to ball1.

wiktionary

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From Middle English ballokes(plural of ballok), from Old English beallucas(nominative plural of bealluc). Synchronically analyzable as bollock +‎ -s.

See bollock

etymonline

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bollocks (n.)

"testicles," 1744, variant of ballocks, from Old English beallucas "testicles," from Proto-Germanic *ball-, from PIE root *bhel- (2) "to blow, swell." In British slang, as an ejaculation, "nonsense!" from 1919.