The term gaoli (高麗, Goryeo) is used to express one of the ancient Korean kingdom. The term bangzi (棒子) is used to express billy club.
The term is said to be originated from the baton-wielding Korean guards during the Japanese occupation of Manchuria. Not trusted by the Japanese, the Korean guards were not given firearms, only batons. The guards often enjoyed teasing Chinese people and beating them with batons, earning enmity among the Chinese.