What does it mean when someone calls you cougar?

older woman an older woman who seeks sexual relationships with much younger men: Hes in his twenties, but he prefers cougars in their forties and fifties to young women his own age.

Is cougar a compliment?

The word cougar is also a slang term for an older woman who dates much younger men. Even when it is meant to be a compliment, like any stereotype, cougar has the potential to offend — best to avoid.