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(nonstandard) That which belongs to hir, theirs (singular). Possessive case of hir, used in place of a noun. Coordinate with his and hers. quotations
S/he leaned forward and, to Selar's surprise, took the doctor's hand firmly between hirs.
1997 July 1, Peter David, Star Trek New Frontier (Book 1), Simon & Schuster
She saw that Burgoyne was hefting hirs experimentally, sweeping it through the air. S/he twirled it around a few times, swung it back and forth.
2000, Peter David, Renaissance (Star Trek New Frontier: Excalibur #2), Simon & Schuster, page 157
Ze takes my right hand in hirs and folds it into a fist.
2006 March 22, Leslie Feinberg, Drag King Dreams, New York: Carroll & Graf, LCC PS3556.E427 D73 2006, page 205