禍水

Etymology
Originally used to describe (Zhao Feiyan), an empress during the, in the erotic fiction .

Empress Xiaocheng was known for her slender build, also giving rise partly to the idiom (literally “plump Huan, slender Fei”).

Noun

 * 1)  charming beauty, as a source of calamity; femme fatale
 * 2)  person or thing that causes great trouble or suffering; scourge; vicious power; bane