bollock n. + Add to list bol·lock Vulgar SynonymsEtymology Synonyms ballballockeggnutorchistesticletestisOriginOEbealluc→MEballok→ENbollock From Middle English ballok, from Old English bealluc (“testicle”, literally “little ball”). By surface analysis, ball + -ock. Idioms1 entry01drop a bollockTo make a mistake.