Green’s Dictionary of Slang

(gay) of a gay man, ejected from the public lavatory where he is looking for sex.

1941		G. Legman ‘Lang. of Homosexuality’ Appendix VII in Henry Sex Variants.
1965		Guild Dict. Homosexual Terms 11: dethroned (v., obs.): Ordered to leave a public toilet. ‘Queens’ are ‘dethroned.’.
1972		B. Rodgers Queens’ Vernacular.
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.