A colloquial expression for the act of grabbing someone by the testicles, often during a fight or rough play.

这两个人在打架时，居然用出了猴子偷桃这种下三滥的手段。

A technique in martial arts involving distracting an opponent with one hand and seizing their testicles with the other.

猴子偷桃是中国传统武术中一个极具杀伤力的招式。