bare-butt vs naked as the day one was born

bare-butt

adj

  • Stark naked. 

  • With the buttocks exposed, as for a spanking or a mooning. 

naked as the day one was born

adj

  • Completely naked. 

How often have the words bare-butt and naked as the day one was born occurred in a corpus of books? (source: Google Ngram Viewer )