Back Up-- What Does "She Gave Me Her Brush" Mean?

Six-year-old boy: I French-kissed my girlfriend today!
17-year-old girl: What? French kissed? You're six!
Six-year-old boy: I still did it. She gave me her brush!
17-year-old girl: You're six! You shouldn't know what French kissing is!
Six-year-old boy: I watch Family Guy.

Philadelphia, Pennsylvania

Overheard by: Mia