not worth a plug nickel vs useless as tits on a boar hog

not worth a plug nickel

adj

  • Having no or almost no value; worthless. 

useless as tits on a boar hog

adj

  • Ineffectual, pointless. 

How often have the words not worth a plug nickel and useless as tits on a boar hog occurred in a corpus of books? (source: Google Ngram Viewer )