"To ask a girl" means to approach a girl or start a conversation with her in order to express your interest in getting to know her better or to ask her out on a date.
Sentences with «to ask a girl»
After some time you can ask girl for date and meet for dinner. (singledatinggirls.com)
How to Ask a Girl Out if She Is Already Dating. (myintimcity.com)
We had men ask girls on dates, and girls finally tell some guys that it just wasn't going to happen. (relevantmagazine.com)