耍二杆子

shuǎ'èrgǎnzi ㄕㄨㄚˇ ㄦˋ ㄍㄢˇ ˙ㄗ

    • to act in a simple-minded, reckless, bull-headed way

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Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
play the second-rate pole
Meaning
To act in a simple-minded, reckless, bull-headed way. Mocking; mostly northern dialect.

Sources