Being Polish, I would never choose such a name, sorry. I actually thought it was you. There is no way I would ever change my name. On any board if you see mplspug, it’s a 99.9% chance it is me. That name goes back about 15 years on the internet with me. I tried a more modern moniker at once, ePug, but that never stuck with me.
So I guess we are left with a guessing game. He called you (I assume) Mr. Bo? The new name is more fitting? Have you recently guided a walleye guy? Did he (or she) call you Mr. Bo?