piece of fluff

noun

1. soft, light down
2. a loose, soft, downy mass of hair, feathers, cotton, dust, etc.
3. any light or trivial matter or talk
4. Theater, Radio, TV an error in speaking or reading a line

transitive verb

1. to shake or pat until loose, feathery, and fluffy
2. Theater, Radio, TV to make an error in speaking or reading (a word, one's lines, etc.)
3. to make a botch of; flub

intransitive verb

1. to become fluffy
2. to make a mistake