An inaccurate phrase created and used by far-right extremists to oppose nondiscrimination laws that protect transgender people. The term is meant to incite fear and panic at the thought of encountering transgender people in public restrooms. Simply refer to the nondiscrimination law/ordinance instead.
For more information about covering nondiscrimination and anti-LGBT bills see Debunking the “Bathroom Bill” Myth — Accurate Reporting on Nondiscrimination: A Guide for Journalists, a publication by GLAAD.
REFERENCE: GLAAD Media Reference Guide-9th Edition