Green’s Dictionary of Slang

grunting peck n.

[SE grunting + peck n.1 (1)]

pork, bacon or any pigmeat.

[UK]Head Canting Academy (2nd edn) s.
[UK]B.E. Dict. Canting Crew n.p.: Grunting Pecck [sic] c. Pork.
[UK]New Canting Dict. [as cit. c.1698].
[UK]Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
[UK]Grose Classical Dict. of the Vulgar Tongue.
[UK]Lex. Balatronicum.
[UK]W.H. Smith ‘The Thieves’s Chaunt’ in Farmer Musa Pedestris (1896) 121: Oh! grunting peck in its eating / Is a richly soft and savoury thing.