Green’s Dictionary of Slang

1. (US) to pursue women.

1913

Sun (Kalgoorlie, WA) 27 July 8/5: [US speaker] ‘We haven’t had any too much time for queenin’ [...] we’ve been too busy feeding our faces’ [queen n. (1a)].

2. to act in an effeminate manner; to pose ostentatiously [queen n. (2)].

1972		B. Rodgers Queens’ Vernacular 164: queen up (Brit gay sl, fr sl queen *queen) 1. to fall into homosexual company 2. to assume girlish mannerisms, such as coating the face with cosmetics and fussing with the hair.
1980		J. McClure Spike Island (1981) 439: There might be a certain amount of uniform queening in it, because most men like to wear a uniform.
1988		A. Hollinghurst Swimming-Pool Library (1998) 65: With James I often reverted to the flaunted deviancy we practised at Oxford, queening along the Cornmarket.
2003		K. Cage Gayle 90/1: queen it up v. act in an ostentatiously effeminate manner (He’s really queening it up tonight!).
2012		(con. 1980s) I. Welsh Skagboys 263: Me n Nicksy are trying tae queen it up a bit, like we’re an item, a genuine homosexual couple.

3. (US) in sadomasochism, squatting over someone's face and possibly defecating, urinating, demanding anlingus, etc.

1987

personal ad, adult bookstore Murray & Murrell Lang. Sadomasochism (1989) 111: I am a submissive slave [...] who will do your every bidding. I’m especially into queening — I want your ass on my face!