bare-butt vs threadbare

bare-butt

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

  • Stark naked. 

threadbare

adj
  • damaged or shabby 

  • shabby, frayed and worn to an extent that warp threads show 

  • wearing clothes of threadbare material 

  • banal or clichéd; trite or hackneyed 

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