Green’s Dictionary of Slang

twink n.2

[? the SE twinkle in his eye; according to Cage, Gayle (2003): ‘from the sponge cake, Twinkie, which is soft, brown and filled with cream.’]

1. (US campus) a male homosexual, or one who is suspected as being such.

[US]Current Sl. II:3 13: Twink, n. A queer or suspected queer.
[US]H. Rawson Dict. of Invective (1991) 397: twink [...] a homosexual.
[US]J. Stahl Bad Sex on Speed 24: His voice is half hardcore speedfreak, half twink.

2. (US gay, also twinkle pie, twinkle toes) an available attractive young boy, whether working for money or not.

[US]Dundes & Schonhorn ‘Kansas University Sl.: A New Generation’ in AS XXXVIII:3 171: Some of the less frequent, but more expressive, phrases are: [...] twink.
[US]Baker et al. CUSS 215: Twinkle toes An effeminate male.
[US]A. Maupin Tales of the City (1984) 218: They usually have the decency to provide one or two decorative twinks.
[US]H. Rawson Dict. of Invective (1991) 397: twink [...] An attractive but soft-headed person.
[US] Queer Sl. in the Gay 90s [Internet] Twink – An attractive, boyish man.
[UK]T. Blacker Kill Your Darlings 246: Only a fucking pervert would do anything to a little twink or a pre.
[US]J. Stahl Plainclothes Naked (2002) 90: I got caboosed by some black Twink witha button nose.
[SA]K. Cage Gayle 100/2: twinkle pie n. underage boy who knows that he is gay, but is legally too young to practise his sexuality (Don’t go for the twinkle pie unless you want a visit from Betty Bangles).
[Aus]P. Temple Truth 338: For openers, pictures of party icon shagging fifteen-year-old twink.
[US] 20 Nov. [Internet] Our ‘twink’ section, porn featuring hairless, younger looking men, often depicted as victims of sexual violence or, alternately, ‘discovering their sexuality’.

3. in weak use of sense 1, a weakling.

[US]C. Hiaasen Star Island (2011) 50: ‘I think my damn foot is broke,’ he whined. ‘Don’t be such a twink.’.