Shotgun, slang since a shotgun does shoot BB's like birdshot, buckshot, etc. The use of "BBgun" is not as alarming to people who might overhear the conversation.
Cops: Where's the gun, where's the gun?
Guy on ground: Just the BB gun I threw it over der
(reviewing Ring camera footage Dec 10 '21 Houston where we see five shotgun blasts at oncoming police cars)
A short phrase for "Baby Doll" as a title and a pet name for your lover. Being the first time that the phrase "BB Doll" was ever defined on Urban Dictionary, the very first BB Doll out there was probably named Brenda and she used to run a music paper from Cleveland, Ohio, called U.S. Rocker, but now anybody can be somebody's BB Doll. Would you be mine? Could you be mine? Won't you be my BB?