durn vs pigging

durn

adj

  • darn; damn. 

adv

  • Darn; damned; extremely. 

intj

  • darn; damn 

verb

  • Rhoticized pronunciation of doing. 

pigging

adj

  • Damned (used as a mild intensive). 

noun

  • The use of a pig (the device) to clean a pipeline. 

How often have the words durn and pigging occurred in a corpus of books? (source: Google Ngram Viewer )