Definition of zirself in English:

zirself

Pronunciation /zirˈself/ /zɪrˈsɛlf/

pronoun

third person singular
  • reflexive Used instead of “himself” or “herself” to refer to a person whose gender is not specified or who is nonbinary.

    ‘ze walked over and introduced zirself’
    • ‘ze has to do it zirself’

Origin

1990s from zir + self, on the model of himself and herself.