Flummox/flummoxed

To be flummoxed is to be confused or bewildered and dates from the early 19th century. Charles Dickens used the word in Pickwick Papers (1837). The OED says it is probably, but not proven to be, of dialectical origin. Other sources maintain that it derives from Herefordshire/Gloucestershire dialects, where it meant to maul or to mangle. The exact origin remains uncertain.