Initialism of British Board of Film Classification.

(Britain) A form of received pronunciation formerly used in British broadcasting.

(Internet slang) Initialism of (I'll) be back in a few (minutes).

(text messaging, Internet slang) Initialism of be back in a few minutes.

(commerce) Initialism of Better Business Bureau.

(physiology) Initialism of blood-brain barrier. / (cardiology) Initialism of bundle branch block.

(politics) Initialism of build(ing) back better.

Initialism of bigger better deal: a potentially better romantic or sexual partner than one's current partner, for whom one may be on the lookout.

A person who uses a BBS (bulletin board system).

plural of BBSer