Wiktionary
pron. (context nonstandard English) (form of Alternative form themselves English)
Usage examples of "theirselves".
People would perch from time to time on our old territory, but them Choctaws or whatever the hell they called theirselves, they was about the only ones that never left.
They got hands like men, and they learned the trick of working iron way back, meteoric iron mostly, and they make great sheets and plates of it to cover theirselves with.
Right in the middle of the dispute, when it looked like maybe the Warrens would get to fighting among theirselves and finish each other before the Barlows could get there, I lit out with the boy Bill, which seemed to have considerable sense for a Warren.
Far as I can see, these folks here wuz just plain out stupid and got theirselves kilt.
They call theirselves the Righteous Rulers, and under their inspired leadership we are gonna drive the money changers outa the Temple.