しろくまカフェ: Week 4 Discussion (Chapters 7 and 8)

Japanese Language Book Clubs
44

Apparently it dates back to a 1969 commercial featuring said actress, and can also be written as 「Oh！モーレツ」. Including the phrase and year in a YouTube search brings up results for the commercial.

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しろくまカフェ :polar_bear: Week 5