The Collaborative International Dictionary of English v.0.48:

balls \balls\, interj.
   nonsense.
   [PJC]

Moby Thesaurus II by Grady Ward, 1.0:

87 Moby Thesaurus words for "balls":
   adventuresomeness, adventurousness, audaciousness, audacity, bag,
   ballocks, baloney, basket, beard, blague, bosh, bravado, bravura,
   breasts, bull, bullshit, bunk, bunkum, cervix, claptrap, clitoris,
   cod, cods, crap, cullions, daring, dauntlessness, derring-do,
   enterprise, eyewash, family jewels, female organs, flam, flimflam,
   foolhardiness, gammon, genitalia, genitals, gonads, guts, heart,
   hogwash, hoke, hokum, hooey, humbug, humbuggery, jiggery-pokery,
   labia, labia majora, labia minora, lingam, lips, male organs, meat,
   mettle, moonshine, moxie, nuts, nymphae, ovary, overboldness,
   penis, phallus, pluck, private parts, privates, privy parts,
   pubic hair, pudenda, reproductive organs, resolution, rocks,
   scrotum, secondary sex characteristic, sex organs, spermary,
   spirit, testes, testicles, uterus, vagina, venturesomeness,
   venturousness, vulva, womb, yoni