bare-butt vs naked as a jaybird

bare-butt

adj
  • Stark naked. 

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

naked as a jaybird

adj
  • Stark naked; nude; especially, naked in a public setting and without embarrassment. 

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