The most accepted definition on Urban Dictionary isn't all that bad:

"An older woman who frequents clubs in order to score with a much younger man. The cougar can be anyone from an overly surgically altered wind tunnel victim, to an absolute sad and bloated old horn-meister, to a real hottie or milf. Cougars are gaining in popularity -- particularly the true hotties -- as young men find not only a sexual high, but many times a chick with her shit together."

Example: That cougar I met last night, showed me shit I didn't know existed, I'm goin back for more.

3726 thumbs up, 480 down

http://www.urbandictionary.com/define.php?term=cougar

Seeeeeeeeee a "cougar" can be "real hottie" with her "shit together" and gives young men a "sexual high." I don't think there's much chance you a "sad and bloated old horn-meister" Holly.