light, downy particles, as of cotton.
a soft, light, downy mass: a fluff of summer clouds.
something of no consequence: The book is pure fluff, but fun to read.
an error or blunder, especially an actor's memory lapse in the delivery of lines.
verb (used with object)
to make into fluff; shake or puff out (feathers, hair, etc.) into a fluffy mass (often followed by up ): to fluff up the sofa pillows.
to make a mistake in: The leading man fluffed his lines.
verb (used without object)
to become fluffy; move, float, or settle down like fluff.
to make a mistake, especially in the delivery of lines by a performer; blunder.

1780–90; perhaps blend of flue2 and puff

fluffer, noun
unfluffed, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fluff (flʌf)
1.  soft light particles, such as the down or nap of cotton or wool
2.  any light downy substance
3.  an object, matter, etc, of little importance; trifle
4.  informal a mistake, esp in speaking or reading lines or performing music
5.  informal a young woman (esp in the phrase a bit of fluff)
6.  to make or become soft and puffy by shaking or patting; puff up
7.  informal to make a mistake in performing (an action, dramatic speech, music, etc)
[C18: perhaps from flue²]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1790, variant of floow "wooly substance, down, nap" (1580s), perhaps from Flem. vluwe, from Fr. velu "shaggy, hairy," from L. vellus "fleece," or L. villus "tuft of hair" (see velvet). OED suggests fluff as "an onomatopoeic modification" of floow, "imitating the action of
puffing away some light substance." The verb meaning "to shake into a soft mass" is first attested 1885; meaning "make a mistake" is from 1884, originally in theater slang. Slang bit of fluff "young woman" is from 1903. The marshmallow confection Fluff dates to c.1920 in Massachusetts, U.S.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
She starts by taking a small handful of fluff, which she molds into a starter
Mission and vision statements can end up being nothing more than fluff.
There is a kernel to this movie which feels harder and more stubborn than the
  pleasing, period fluff that enfolds it.
It was going to be a fluff piece that complimented her, actually.
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