Definition of "blackguardly"

Blackguardly barneys called boxing competitions.

1882 September 2, Evening News, column 6, page 1

Slipping the rope from the jenny, he handed her off to his fellow in blackguardly deals, and with remarkable inconspicuity put on the halter and dug in his heels.

2017, Jan D. Hodge, The Bard & Scheherazade Keep Company, San Jose, Calif.: Able Muse Press, page 55