Definition of B&B:
(n) :
The quantity one billion (1,000,000,000), usually used to signify a sum of money.
(n) :
An academic grade, better than a C and worse than an A.
(n) :
(Australia, euphemistic, countable) Bastard.
(n) :
(euphemistic, countable) Bitch.
(n) :
Signifies a second-tier or second class of a given commodity, group, or category, as in B-movie, B-list, etc.
(n) :
(British) The grade of pencil, “black”, that makes darker marks than grade HB but lighter marks than grade 2B; a pencil with soft lead.