Its short for baby.

A Bloomer is someone with a bright outlook on life who is optimistic in nature. Bloomer's frolic in every opportunity to be happy and try to make the most out of life. The opposite of a Bloomer is a Doomer. The term Bloomer originated specifically as a counter to the Doomer on sites especially like 4Chan.

Netspeak for baby, most likely used at the end a phrase as an added emphasis or exaggeration.

Short for "baby".
Usually used on the internet on forums, comments, profiles, messages, IMs etc.

A pet name for friends meaning 'baby'. An exclusive word that can only be used by people of certain ranking.
The word 'bb' originated in the mid New Hampshire Dartmouth area.

Short for baby or beebee used in a humor sense.