亂放炮

Simplified: 乱放炮

luànfàngpào ㄌㄨㄢˋ ㄈㄤˋ ㄆㄠˋ

    • to speak carelessly and loudly regardless of the facts
    • to shoot one's mouth off

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
fire cannons at random
Meaning
To speak carelessly and make loud remarks without regard to the facts. Critical; like 'shooting your mouth off'.

Sources