1968, in the meaning defined above
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From the Editors at Merriam-Webster
'Buck Naked' or 'Butt Naked'?
It's a natural question
Cite this Entry
“Butt naked.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/butt%20naked. Accessed 23 Jan. 2022.
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