Puma refers to an attractive woman in her late 20s or early 30s. She is a pre-cougar. Cougar is an older woman who frequents clubs in order to score with a much younger man.

“美洲狮”指的是年纪在三十岁左右的漂亮女人。她具有发展为熟女的潜力。熟女指的是经常光临夜店、以钓到年轻男子为目的的老女人。

Example:

I think that puma just grabbed my ass.

那只“美洲狮”刚刚摸了我的屁股！