A list or group of the ones that are not as not as desired, admired or well known as those on the A-list. Usually used when describing actors.
e.g. A B-list actor usually cannot afford to turn down as many roles as a mega star can.
A derogatory term for a person/group of people who think they are 'all that', but are in fact not.
John's so fucking B-list!
Check out those B-list cunts.