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, Meaning & Synonyms
Bubsy Know Your Meme
Bubsy Know Your Meme
Booby Definition & Meaning - Merriam-Webster
Bubsy Know Your Meme
Bubsy Know Your Meme
Bubsy Know Your Meme
BOOBY definition in American English
Is it spelled boobie or booby?
BOOBY definition in the Cambridge English Dictionary
Bubsy Know Your Meme