Green’s Dictionary of Slang

(gay) to leave a public lavatory in which one is soliciting to avoid interrogation by its attendant or a police officer.

1941		G. Legman ‘Lang. of Homosexuality’ Appendix VII in Henry Sex Variants.
1965		Guild Dict. Homosexual Terms 1: abdicate (v.): Forced to leave a public toilet by an attendant; said of male homosexuals who frequent public rest rooms. Thus, queens are forced to abdicate.
1972		B. Rodgers Queens’ Vernacular.
1986–7		Maledicta IX 161: When one considers the inventiveness of some gay slang [...] abdicate for a queen forced off the throne she was lurking on in a public toilet.
1989–2003		R.O. Scott Gay Sl. Dict. 🌐 abdicate: to leave a public toilet because a vice squad officer or a toilet attendant comes in. ‘Eric, its time to abdicate the throne to the cops.’.
2010		W. Ings ‘Trolling the Beat to Working the Soob’ in Int’l Jrnl Lexicog. 23:1 65: If the police or queer bashers threatened him he might be forced to abdicate, or if he was arrested he was dethroned.