すっぽんぽん

na-adjective, noun

stark naked; completely nude

Colloquial and somewhat humorous or childish expression for being completely naked. Often used in lighthearted or teasing contexts.

• 温おん泉せんから上あがって、すっぽんぽんで走はしり回まわる子こ供どもたち。

  The kids ran around stark naked after getting out of the hot spring.

• 彼かれはすっぽんぽんのまま玄げん関かんに出でてしまった。

  He accidentally went out to the front door completely naked.