Dictionary definition · fluff
noun
- any light downy material
- something of little value or significance
- a blunder (especially an actor's forgetting the lines)
verb
- make a mess of, destroy or ruin"I botched the dinner and we had to eat out"
- erect or fluff up"the bird ruffled its feathers"
- ruffle (one's hair) by combing the ends towards the scalp, for a full effect
Source: Open English WordNet (CC BY 4.0).