Any woman, usually a mother, who dates, sleeps with, or seeks out men for companionship that are 5 years or more the womans junior. Generally attractive, can be slutty but not a requirement. They tend to enjoy the company of the younger crowd due to being more free spirited. Not incapable of getting older men just generally highly sexual and finds younger men to be more her sexual equal than older gentlemen. Does not need to be over 30 but most of these women are.
"Dude, you're like 24, how old is your lady?"
"She's 30 dude, bagged myself a cougar. Giggity."