In Henry Dunbar: The Story of an Outcast by Mary Elizabeth Braddon, set around 1850 and published 1864, we have the following:
The footman made no response to his parting civility, but stood watching him for a few moments, and then closed the door with a bang.
"Hif that's a spessermin of your Hinjun acquaintances, I don't think much of Hinjur or Hinjun serciety. But what can you expect of a nation as insults the gentleman who waits behind his employer's chair at table by callin' him a kitten-muncher?"
I assume that it is a mispronunciation, but I can't guess what is meant by "kitten-muncher".