Origin of theirself
Examples from the Web for theirself
Contemporary Examples of theirself
“We live in a society where there are girls who are in love with theirself and flaunt it but the majority are insecure,” says one.Cara Delevingne Posts Protest Picture Of Her Boob (With Taped-Out Nipple)
July 14, 2014
Historical Examples of theirself
c.1300, variant of themself, with self, originally an inflected adjective, treated as a noun with a meaning "person." Related: Theirselves.