溜溝子

Simplified: 溜沟子

liūgōuzi ㄌㄧㄡ ㄍㄡ ˙ㄗ

    • to fawn on and flatter people shamelessly
    • to brown-nose

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

May offend: vulgar language

Literally
lick the buttock crease
Meaning
To fawn on and flatter people shamelessly. Crude and contemptuous; compare "kiss up to" or "brown-nose".

Sources