Two meanings. One means to provoke a girl's chin, to coerce a girl to face his threat or intimidation, and to make a girl feel fear or fear from her heart, so as to achieve her desired purpose or requirement; Another meaning is ambiguity. It is a small interest between two people that a man provokes a girl's chin, and it is an interaction between lovers.

　　Generally speaking, if a boy is not familiar with a girl, he will not casually have too close physical contact with the girl.

　　A boy has a good relationship with you, and he may occasionally want to tease you, so he can't help but get started with you.

　　Picking your chin with your hand is quite ambiguous. When a girl is treated like this by a boy, she will feel a little shy and puzzled. The girl will definitely misunderstand whether the boy likes herself or not.

　　If you are shy, or flatter yourself that he likes you, then his purpose of flirting with you has been achieved.