or Captain Hackum, or hackster, subs. (old).A bully; a bravo. For synonyms, see FURIOSO.
1659. Lady Alimony, i., 3 (DODSLEY, Old Plays (HAZLITT), 4th ed., 1875, xiv., p. 282). Vowing, like a desperate HAXTER, that he has express command to seize upon all our properties.
c. 1696. B. E., A New Dictionary of the Canting Crew, s.v. HACKAM, Fighting Fellow.
1725. A New Canting Dictionary, s.v.
1785. GROSE, A Classical Dictionary of the Vulgar Tongue, s.v. HACKUM. Captain Hackum; a bravo, a slasher.
1859. G. W. MATSELL, Vocabulum; or, The Rogues Lexicon, s.v. HACKUM. A bravado; a slasher. Capt. Hackum, a fellow who slashes with a bowie-knife.