A woman who, for some unknown reason, is attracted to men she finds out are younger than she is, often significantly so. She looks younger than her age, acts younger than her age, and has the confidence she didn't have when she was younger - which younger men apparently find appealing. She's not always the bottle blond, surgically enhanced woman described in other definitions of the word. She most often has her life in order and has earned her independence. She's probably not had a conventional life and she's ok with that. Many of her friends don't get it and tell her to find some old rich fart to die with.
This is a cougar scenario of the kind described above: The flirtation had gone on for weeks and he finally asked her for her number. She gave it to him knowing he was another young one. When she found out how old he really was, she sighed on the inside. All she could say was, "I'm a bit older than you." He guessed she was about 38 and in her head she said, "Yeah, that's how old I was when I had my daughter who is now 15." Another sigh.