What does this Spanish word mean?

Is there such a word as bn in Spanish? A friend's 13 year old daughter is a lovely looking girl and has a few comments from school friends about how pretty she is in a photo on her Facebook, someone (a random friends request she put out for an application) has put, "Si eres bn fea." I have googled most of the words and if am correct understand si to be yes (obviously), eres to be you and fea to be the feminine form of ugly. Cannot find bn though. Is it meaning yes, you are ugly, or yes, you are not ugly?