Something written in extravagant praise, esp for sales purposes; hype: But as my brassy page-one editor would say, those portrayals are puff pieces(1980s+)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with puff-piece
An approving or flattering article, as in That was really a puff piece about the conductor, written by her cousin. The use of puff for “exaggerated praise” dates from about 1600; piece was added in the mid-1900s.