over the fence vs undesirable

over the fence

prep
  • Used other than figuratively or idiomatically: see over, fence. 

  • Entering, or having entered, the airfield in preparation for landing. 

undesirable

adj
  • objectionable or not likely to please 

noun
  • An undesirable person. 

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