Dic: purple prose, purple passage

■  purple prose/passage: writing that uses difficult or unusual words - used in order to show disapproval

..... LDOCE

■

1. a passage conspicuous for brilliance or effectiveness in a work that is dull, commonplace, or uninspired.
2. [chiefly British] a piece of obtrusively ornate writing —called also purple patch

Origin of PURPLE PASSAGE: translation of Latin pannus purpureus purple patch; from the traditional splendor of purple cloth as contrasted with plainer materials

.... http://www.merriam-webster.com/dictionary/purple%20passage

■ http://en.wikipedia.org/wiki/Purple_prose