quot;Boin" (ボイン)is slang for boobies (or a busty woman) in Japanese. So the package says it
Booby Definition & Meaning - Merriam-Webster
BOOBY definition and meaning
BOOBY definition and meaning
booby, meaning of booby in Longman Dictionary of Contemporary English
BOOBY definition and meaning
booby, meaning of booby in Longman Dictionary of Contemporary English
BOOBY definition and meaning
I am a boob? - WaniKani - WaniKani Community
BOOBY definition in the Cambridge English Dictionary
BOOBY definition and meaning
Is it spelled boobie or booby?
BOOBY definition in American English
I am a boob? - WaniKani - WaniKani Community
BOOBY definition and meaning
BOOBY definition in American English