1640s, dialectal and American English variant of champ (v.). Related: Chomped; chomping.
Entries linking to chomp
champ v.
1520s, "to chew noisily, crunch;" 1570s (of horses) "to bite repeatedly and impatiently," probably echoic; OED suggests a connection with jam (v.). Earlier also cham, chamb, etc. (late 14c.). To champ on (or at) the bit, as an eager horse will, is attested in the figurative sense by 1640s. Related: Champed; champing. As a noun, "act of biting repeatedly, action of champing," from c. 1600.