The Collaborative International Dictionary
hain't
Han't \Han't\ (h[=a]nt; in England, h[aum]nt). A contraction of have not, or has not, used in illiterate speech. In the United States the commoner spelling is hain't.
Wiktionary
hain't
contraction 1 (context dialectal archaic English) has not 2 (context dialectal archaic English) have not 3 (context dialectal hypercorrect English) ain't