From Longman Dictionary of Contemporary Englishpurple prose/passagepurple prose/passageALwriting that uses difficult or unusual words – used to show disapproval → purple
Examples from the Corpus
purple prose/passage• In his maturity what he remembered of his style of speaking were purple passages and a rather caustic irony.• Lady Thatcher will be honing her purple prose for the debate in the Lords.• William Holden plays a hack scriptwriter down on his luck, and his purple prose gives the film its biting tone. 