▪ I.hacky,a.1colloq.|ˈhækɪ| [f. hack v.1 + -y1.] Of a cough: Characterized by hacking. Mod.Advt., That rasping hacky cough of yours. ▪ II.hacky,a.2colloq. [f. hack n.3 + -y1.] Of the nature of a hack (horse). 1870Daily News 6 June, Britannia [a mare]..she is ‘hacky’, and in the wrong place here.