typically someone who is trying to baby talk thru texting, uses this term. or it could mean, "babyboy."
Boujee Busser, generally meaning a girl who sleeps with a lot of men but acts innocent time to time.
"yea dat girl alyssa a total BB ofn"
BB can mean baby or best bitch. It’s a nickname for couples or Bestfriends.
Me and my BB went downtown last night.