Green’s Dictionary of Slang

tearoom n.

also teahouse, t-room
[SE toilet + room + play on tearoom]

(US gay) a public lavatory popular for casual sex and assignations; also attrib.

[US]A.J. Rosanoff Manual of Psychiatry in Katz Gay/Lesbian Almanac (1983) 440: Tea house, a public lavatory frequented by homosexuals.
[US]‘R. Scully’ Scarlet Pansy 191: Fay and Bobby on their way home dropped into the tearoom which the Butsches patronized at the time and where some of their number could be found every afternoon.
G. Foster Lust 101: Say, I always know when I’m hungry, and I get somthin’ to eat pretty quick. There’s always at least one muzzler in de Tea House, an’ I know how to make their tongues hang out.
[US]‘Swasarnt Nerf’ et al. Gay Girl’s Guide 16: tearoom (t-room): Men’s Room, Toilet.
[US]‘Swasarnt Nerf’ Gaedicker’s Sodom-on-the-Hudson 16: T-ROOMS. It would be difficult to fix any complete list for head-queens.
[US]J. Rechy City of Night 183: A queen, camping by the head, calls out, ‘Hi, babe — welcome to Jenny’s tearoom.’.
[US]B. Rodgers Queens’ Vernacular 194: teahouse [of the August moon] public toilet.
[US]L. Kramer Faggots 105: Today he’d tried two new things. A golden shower and a tea-room.
[US]K. Vacha Quiet Fire 147: I had very little tearoom sex except maybe for a quick blow job — being blown.
[US]Gaymart.com Queer Sl. in the Gay 90s 🌐 Tearoom – A public lavatory that is often cruised by gay men.
Johnsbooks.com 🌐 I walk back to the other tearoom with action in progress with a new cast of characters. A bunch of black homies are standing looking serious, guarding something in the back shitter.

In compounds

tearoom queen (n.) (also tearoom cruiser, T-room queen) [-queen sfx]

(US gay) a homosexual who hangs around public lavatories for sex.

[US]Lavender Lex. n.p.: t room queen:– A homosexual who enjoys or engages in cruising in public toilets. Among the gay it is a term of scorn.
[US]Trimble 5000 Adult Sex Words and Phrases.
[US]J.P. Stanley ‘Homosexual Sl.’ in AS XLV:1/2 53: The most popular compound formation involves some nouns plus queen [...] size queen, rim queen, tearoom queen.
[US]L. Kramer Faggots 108: I get sick of loitering at the loos. [...] I am not a tea-room queen.
[US]Maledicta VI:1+2 (Summer/Winter) 139: [A] gay prostitute (young volunteer, call-boy, cottage or tea-room cruiser or troller, club and pub pro).
[US]H. Max Gay (S)language.
tearoom trade (n.) [trade n. (3)] (US gay)

1. (also T-room trade) the world of sexual assignations, pick-ups and consummation practised in public lavatories.

[US] in R.A.L. Humphreys Tearoom Trade 97: [title] I stopped to cruise that tearoom on the north side of the park.
[US]Maledicta IV:2 (Winter) 233: One was described as ‘a marvel of dexterity at the cottage upright,’ suggesting not piano-playing but the tea-room trade [...] at urinals in cottages = public lavatories.
[NZ]W. Ings ‘Trolling the Beat to Working the Soob’ in Int’l Jrnl Lexicog. 23:1 61: The bog trade refers to soliciting for sex in public toilets. It can be compared to Australia’s cruising the beats, the U.S. T-room trade and the English verb cottaging.

2. men who enjoy being fellated in public lavatories.

[US]B. Rodgers Queens’ Vernacular 195: tearoom trade men who dig getting blown in public lavatories.
[US]H. Max Gay (S)language 42: Tearoom trade — non-gay male who frequents men’s rooms to be fellated.