ボイン

From English boing.

• IPA^(key): [bo̞ĩɴ]

ボイン (hiragana ぼいん, rōmaji boin)

1. with a wham, with a wallop

   拳骨 (げんこつ)でボインと殴 (なぐ)る

   genkotsu de boin to naguru

   to hit someone wham with [your] fists

2. with a boing, with a sproing

   ボインと跳 (は)ねる

   boin to haneru

   to leap with a sproing

Takes the particle と (to).

ボイン (hiragana ぼいん, rōmaji boin)

1. large breasts

   あの子 (こ)はすごいボインだよ。

   Ano ko wa sugoi boin da yo.

   That girl is stacked. / That girl has great boobs.

   • 2009 April 24, 間島淳司 [Junji Majima] as 青木大介 [Daisuke Aoki], “2科目 たのしいうんどうかい [Fun Athletic Meet]”, in 菅沼栄治 [Eiji Suganuma], editor, こどものじかん 2学期 [Kodomo no Jikan], Tokyo: Studio Barcelona, published 2009, 5:20 from the start:

     教員対抗 (きょういんたいこう)リレーもあるのに、そんな大 (おお)きな胸 (むね)で走 (はし)れますかね。ボイン先 (せん)生 (せい)。

     Kyōin taikō rirē mo aru no ni, sonna ōki na mune de hashiremasu ka ne. Boin sensei.

     There's a teachers' relay, too, but… I wonder if you can run with breasts that big… 'Boin' sensei.

• 巨 (きょ)乳 (にゅう) (kyonyū)