吃豆腐

Etymology
From Qing Dynasty novel 《驚夢啼》, in which many men patronized a tofu business for the opportunity to flirt with the beautiful owner.

Verb

 * 1)  to come on to a woman; to flirt; to grope; to touch up

Usage notes

 * This idiom usually only refers to a man taking advantage of a woman in a sexual manner.