hisn

alternative his'n

1. AppalachiaUKUSdialectalespeciallyHis.First known use 15th c.

   An' every feller felt ez though all Mexico wuz hisn.

   1848, James Russell Lowell, The Biglow Papers

   2 more examples

   I will not show him this letter of yours, though you seem to desire it, lest it should provoke him to be too severe a schoolmaster, when you are his'n.

   1748, [Samuel Richardson], “Letter XXXII”, in Clarissa. Or, The History of a Young Lady: […], volume (please specify |volume=I to VII), London: […] S[amuel] Richardson; [a]nd sold by John Osborn, […], →OCLC

   But in the absolute whosen is often substituted, as in "if it ain't hisn, then whosen is it?" The imitation is obvious.

   [1921 [1919], H. L. Mencken, The American Language, 2nd edition, New York: Alfred A. Knopf, →ISBN, →OCLC, page 297