What is a "cougar?" And no, I don't mean a wild cat - well not exactly anyway. The term cougar, refers to a woman who's dating, having sex with, or married to a much younger man, and usually the woman is 35 or older and their partner is at least 8 to 10 years younger. Hollywood has it's fair share of cougars, and apparently Halle Berry is at the top of the list!