It's a term for one's partner. "Before All Else" I think? A three letter vendor name has a nice convenience to it.
In this era you don't get to name your vendors, its not (or at least wasn't uncommon) to buy multiple vendors until getting a name you like. Unless it was "bae" you were asking about, then yeah like others said, it was the cool kid lingo a couple years ago for someone's SO
I have been searching for some good vendor names, and have come across Bea, and have decided to sell due to its real word meaning and marketing potential. "Come see my Bae at yet gate" And with most the vendor names I have been getting are more along the times of Augusta or Constantine, this one stands out.