go H.A.M. vs have kittens

go H.A.M.

have kittens

verb
  • To be in a state of frantic nervousness. 

  • To become extremely upset. 

  • Usually of a female cat, to give birth to kittens. 

How often have the words go H.A.M. and have kittens occurred in a corpus of books? (source: Google Ngram Viewer )