To not know what BPB is?

[Somersetlady]

I tried to look it up on the mn acronyms page but is not there.

A thread is was on had this message come up. I’m lost.

It's PBP - previously banned poster.

Previously banned poster.

Previously Banned Poster

Thank you @BertieBotts

Previously Banned Poster (you have put the wrong letters in your title btw)