尖脑壳

Traditional (Taiwan): 尖腦殼

jiānnǎoké ㄐㄧㄢ ㄋㄠˇ ㄎㄜˊ

    • scheming person who wangles advantages
    • crafty person

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
pointed head
Meaning
A person who is good at scheming and wangling advantages. Derogatory, from Sichuan-area speech.

Sources