build up

to increase

bulk

the bulk - the majority, the greater part

bull

bull - something that is untrue or nonsense

bully for you

bully for you! - said to show approval, usually sarcastic

bumf

bumf - printed material, leaflets, pamphlets etc..

bummer

something unfortunate or annoying

bump into

meet by accident

bumper

a large amount

bung

to bung - to put something somewhere in a careless way

bunk off

to bunk off - not go to work or school, play truant