泔水缸

gānshuǐgāng ㄍㄢ ㄕㄨㄟˇ ㄍㄤ

    • person who takes harsh words without reacting
    • thick-skinned person

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
swill vat
Meaning
A person who can take any harsh or ugly words without reacting. Informal, can be jokingly self-deprecating.

Sources