- birdbrain
- before you kinow it
- batty
- bushwa
- bum
- blow one's stack
- blue funk
- brahms and Liszt
- blow
- bounder
- blitheness
- butter-wouldn't-melt
- bork
- bucks
- blighter
- bladdered
- bent out of shape
- befouled
- berk
- brattish
- boff
- buggy
- besmirched
- begrimed
- brill
- beanfeast
- beaut
- beauteous
- beano
- bibulous
- bunfigh
- block-headed
- bozo
- blow me down with a feather
- black English def
- barking
- barking mad
- be mad have a screw loose
- boofhead