Wiktionary
vb. 1 To plump up 2 (context idiomatic English) to make a gaffe or blunder.
WordNet
Usage examples of "fluff up".
He saw the pile of her hair fluff up in happy disarray and then, suddenly, penitent, slide down behind her neck, curl over her shoulder and hang to her waist in a plait as thick as his wrist.
I flap my wings and I squawk and I fluff up and I slick down and I throw seed and I attack that dangly toy as if it was the guy's balls, but it does no good.
Christine made a brief visit to her appointed chambera small box room at the back of the house wedged between two chimneys, both of which blocked the view from the window and gave her only a narrow glimpse of the kitchen garden belowin order to take off her bonnet, fluff up her curls, and unpack her meager belongings.
We pick the lint and toilet paper off each other, and I fluff up the flat back of Brandy's hair.
He had barely managed to test out the mattress and fluff up the pillow before Rhombur came pounding on his door.
I was trying to fluff up the crushed flowers when the butterfly came fluttering back.
Sarah would then moan and toss for in the meanwhile I, taking a soft brush, would fluff up her mass of pubic hairs and so tickle her with the bristles at the same time.