Source : Webster's Revised Unabridged Dictionary (1913)

Twink \Twink\, v. i. [OE. twinken. See {Twinkle}.]
   To twinkle. [Obs.]

Twink \Twink\, n.
   1. A wink; a twinkling. [Obs.]

   2. (Zo["o]l.) The chaffinch. [Prov. Eng.]

Source : Free On-Line Dictionary of Computing

twink
     
        /twink/ [UCSC] Equivalent to {read-only user}.  Also reported
        on the {Usenet} group soc.motss; may derive from gay slang for
        a cute young thing with nothing upstairs (compare mainstream
        "chick").