(archaic) In no time at all; immediately.

nimble; agile with one's feet

Alternative form of in the twinkling of a bedstaff

Of a twinkling light, to cease to twinkle.

(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.

Of a person, not yet conceived, particularly when referring to a time period preceding their conception.