Green’s Dictionary of Slang

bono adj.

good.

1854		Spirit of the Times (Ironton, OH) 26 Dec. 2/3: Salutations [...] An English soldier and a French soldier meet [...] the former commences with ‘Bono Francais,’ and the answer is ‘Bono Anglish’. With a Turk it is ‘Bono Johnny’.
1861		(con. 1840s–50s) H. Mayhew London Labour and London Poor III 55/2: Clown. No bono, allez tooti sweet, Mounseer.
1875		T. Frost Circus Life and Circus Celebrities 277: Bona (good) is used both as an adjective, and as an exclamation of approval or admiration.
1893		P.H. Emerson Signor Lippo 11: But say, culls, that clobber vardys bono.

In compounds

bono omee (n.) [omee n. (2)]

a husband.

1984

Partridge DSUE (8th edn) 115/1: mid-C.19–20.