灌猫尿

Traditional (Taiwan): 灌貓尿

guànmāoniào ㄍㄨㄢˋ ㄇㄠ ㄋㄧㄠˋ

    • to drink alcohol, especially to excess (crude)

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

May offend: vulgar language

Literally
pour down cat urine
Meaning
A crude, jokey way to say drink alcohol, especially to excess.

Sources