Twinkle In One's Father's Eye Meaning

(idiomatic, colloquial, humorous) A notional look of anticipation or hope (either for sex or a child) in one's father's eyes at or around the time of one's conception.

Example: 1975, Terry Blake, The Fig Tree, Aim Publishing (1975), page 26:
  Kimberly handed him a whisky and said: "So's that, my boy. Forty-eight-year-old Glenlivet. This was a connoisseur's drop before you were a twinkle in your father's eye."
1992, Martina Cole, Dangerous Lady, Headline Publishing (2008), ISBN 9780755350704, unnumbered page:
  'Don't you take the piss out of me, sonny. I was doing this job when you were just a drunken twinkle in your father's eye!'
2010, Max Overton & Jim Darley, Sequestered, Sequestered Books (2010), ISBN 9780980838701, unnumbered page:
  â€œThirty years ago you would not even have been a twinkle in your father's eye.”
For more examples of usage of this term, see Citations:twinkle in one's father's eye.