yóu​guāng​shuǐ​huá

sleek and shiny

油光水滑 yóu​guāng​shuǐ​huá
sleek and shiny
sleek, shiny, and smooth; often used to describe hair, fur, or surfaces that appear oily or polished from frequent use or grooming
slippery and crafty
(metaphorical) crafty, untrustworthy, and slick; describes a person who is deceitful or smooth-talking, like the character of a rascal or swindler

Frequency

Written text
0.052 per million

Sources

Frequency data
BCC Corpus (BLCU)