c.1400, "a winking of the eye," also "a twinkle" (1830), from twinkle. Meaning "young sexually attractive person" is recorded from 1963, probably from Twinkies, trademark name of a cupcake junk food introduced in 1930 by Continental Baking Co., apparently an alteration of twinkle. But cf. 1920s-30s British homosexual slang twank in a similar sense.
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").