Oxford History of Modern Slang, By John Ayto and John Simpson

Take a butcher's ("short for butcher's hook, rhyming slang for look") at this hash-up ("something concocted afresh from existing material") of street lingo ("probably from Portuguese lingoa language") and you'll expand your vocabulary with such terms as lallygag (dawdle) and slug-nutty (punch drunk).

It is strange how dog's bollocks ("someone outstanding in their field") swept the nation, while the related scrote ("shortening of scrotum... a worthless person") has failed to escape from a milieu described as "orig. police and prisoners". This book is a gab-fest, possibly over-influenced by Stateside slang.