How to say "balls" in Japanese

• タマキン
  nounSlang for 'balls' in the testicles sense. It suits crude, jokey casual talk such as banter between friends and is out of place in neutral or polite contexts.
• 金玉きんたま
  nounA colloquial word for the testicles, with the blunt force of English 'nuts'. Literally 'gold balls', it belongs to rough casual talk and is out of place in polite or formal contexts.
• たまたま
  nounChildren's language for the testicles — the nursery word for 'balls'. An adult using it sounds babyish or playful; it is not a neutral adult term.
• 玉袋たまぶくろ
  nounColloquial, literally 'ball pouch': it properly names the scrotum, so use it when you mean the sac rather than the testicles themselves; as a rendering of 'balls' it is loose at best.

All four are less common, informal words for 'balls' as a body part: 「タマキン」 is slang and 金玉 colloquial for the testicles, 「たまたま」 is children's language, and 玉袋 really means the scrotum.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• タマキンballs
• 金玉きんたまtesticles
• たまたまtesticles
• 玉袋たまぶくろscrotum