Top Definition
A pubescent girl beginning to display behavioural or physical characteristics that make her an object of lust by adult men. Etymology: 'post-' + 'nymphet'
"And then I think of the fantasies starting. He is eyeing the fourteen-year-old postnymphets in bikinis. She covets the TV repairman."

- Erica Jong, 'Fear of Flying'
by LukeT September 05, 2007

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