Fluff (fiction) definition

(1) A blunder (especially an actor's forgetting the lines)

(2) Something of little value or significance

(3) Any light downy material

(4) Ruffle (one's hair) by combing towards the ends towards the scalp, for a full effect

(5) Erect or fluff up

"The bird ruffled its feathers"

(6) Make a mess of, destroy or ruin

"I botched the dinner and we had to eat out"

"The pianist screwed up the difficult passage in the second movement"