thanks for that...I always thought of 'codswallop' as a slap across the face with a dead fish!
Beg to differ. 'Cod' is archaic slang for 'penis'; a 'codpiece', for instance, is a genital pouch. 'Codswallop' is that which is produced by walloping the penis, a substance of little esteem which delicacy forbids us from describing further.