My mom is not a FOB

On our way to NYC via Greyhound bus and bus driver makes an announcement

Bus driver: Welcome aboard the Greyhound Bus to New York City. Now does anyone know how to get there? I don't have a GPS

everyone laughs and I look over to mom to see if she understood.

Ally: (In Chinese) Mom did you understand what the bus driver said?

Mom: (In English) Yes I am no F.O.B.