Green’s Dictionary of Slang

of writing, lightweight, nonsensical, meaningless; of courses, easy.

1939		R. Chandler ‘Pearls Are a Nuisance’ in Spanish Blood (1946) 121: You got something with that daisy pan and that fluff talk.
1994		N. McCall Makes Me Wanna Holler (1995) 335: I grew tired of writing one-sided fluff pieces.
1999		Eble Campus Sl. Nov. 4: fluff – easy, not challenging: ‘I heard you signed up for some fluff classes’.
2008		J. Lansdale Leather Maiden 57: ‘Kick Jesus in the balls one week, then do some fluff piece or a profile’.