Green’s Dictionary of Slang

a pork butcher.

1840		Norfolk Chron. 4 July 4/6: William Mullenger [...] Pork Butcher, Kiddier and Eating-house Keeper.
1860		Hotten Dict. of Modern Sl. etc. (2nd edn).
1867		Norfolk News 4 May 8/5: The above Estate forms a most eligible Residence and Occupation for a Butcher, Kiddier, or Dealer.
1873		Sl. Dict.
1895		C. Crowe Aus. Sl. Dict. 41: Kidder [sic], a pork butcher.