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Yomi
すっぽんぽん
Rōmaji
supponpon
Type
adjective
Meaning
completely naked
Synonym
全裸
Additional Info
It’s a humorous and very casual way of saying 全裸 (ぜんら, “completely naked”).
Not related to this word at all, but スッポン means “a soft-shell turtle” and used in an idiom: 月とスッポン
Example
え、ここでスッポンポンになるの？
What, am I getting completely naked here?