Green’s Dictionary of Slang

donnelly n.

[the prize-fighter Daniel Donnelly (1788–1820)]

(US) a heavy blow or punch.

[US]D. Corcoran ‘A Brandy and Peppermint Party’ Pickings from N.O. Picayune 125: Ye whar might wake intirely whin ye gave me this Donnelly (a thump) undher the eye .