I've actually heard this one before. It's a Vietnamese thing. A girl I knew back in junior high (an Ahn-Thuy Nguyen) used to the say the same thing–to everyone's FOB delight.
PearlHarbor
My mom literally cited this exact same case to me! They must read the same Chinese newspaper
Believe it or not, My Mom is a Fob is now available in print! Not only does the book showcase your favorite entries as well as never-before-published submissions, it also features essays by the authors, Teresa and Serena Wu, and a forward by comedian Margaret Cho! Grab your copy of the book today on Amazon, Borders, or Barnes & Noble!