“Big breasts” in Japanese
Short answer
ボイン
boin
Big breasts in Japanese is “ボイン” (boin). Full meaning: big breasts, big boobs; boing, sproing, pow.
Other ways to say “Big breasts” in Japanese
ぼいん
boin big breasts, big boobs; boing, sproing, pow
ボインボイン
boinboin big breasts, big boobs; boing-boing
圃隱
hoin big breasts, big boobs; boing, sproing, pow
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