B is a gang sign, that stands for "bedolaga". In Russian drill sub-culture this word actually mean a guy, who is originally poor and now trying to escape from the trap by selling stuff or scamming, or finessing other thugs.
Speaker 1: Yoo, that guy was brokie as fuck a month ago but now hi's ballin Speaker 2: U God damn right, that man is real B (bedolaga). I heard he was selling crack or smth like that
Used in paintball to describe weather you can bring your own paintballs to the field, or if you have to buy the field's paint.There is usually a fee for this - fields have to make money.