Someone pretends to moisten a finger, then touches it briefly to her posterior and mimes the effect of the finger "sizzling" -- to the accompaniment of a "Tsss" vocalization.   And how about the triumphant "Yessss!" that is always(?) accompanied by body language?  Or Fonzie's "Ayyyy" with thumb extended?  Or the one where someone acknowledges someone else by briefly pointing at him/her while making a one- or two-syllable clicking sound (reminiscent of a shutter-release)?

"The shed went quiet save for the pfft of Paul dragging on his cigarette." —Screwthedaisies, Things Inside.

"He could hardly be held accountable for determining how much time had passed in her presence, for soon she was gone: 'Pfft,' he expounded." —Joseph Di Prisco, Confessions of Brother Eli.

"Don't go pfft. It's true," he said. —Sue Miller, While I Was Gone.

"I just — pfft-pfft — spent money like that." —John Miller Chernoff, Hustling is Not Stealing.

MORRIS: What does that mean — pfft?
SHLOMO: It means nothing. ... Pfft this, pfft that.
—Allan Knee, Second Avenue Rag.

"'Pfft, pfft, pfft,' Mama made spitting noises to drive away the demons." —Sylvia Smoller, Rachel and Aleks.

"The pfft! would be complete if I had developed any flair for fiction." —C. H. (Brick) Garrigues

"I've never told you but back in London (that time she was in hospital and refused to see me) she almost gave up the ghost pfft." —Gérard Bessette, Incubation.

"The moth bounced against a row of books: pfft, pfft, pfft." —Andrea Barrett, The Voyage of the Narwhal.

"Of course, the audience was full of the most dreadful people imaginable, and all these balloons were going pfft, pfft, pfft." —Elton John, The Rolling Stone Interviews.

"'Pfft — pfft — pfft!'  That is the stars whistling for the soul of the shaman." —John MacDonald, The Arctic Sky: Inuit Astronomy, Star Lore, and Legend.

"He thought for a second and shpritzed me with four quicker, quieter Bronx cheers: 'Pfft, pfft, pfft, pfft.' ... And I had no idea PFFFFFFT was a four-letter word." —Joel Siegel, Lessons For Dylan.

"At night, a figure in dungarees with a mop of shaggy hair would have shaken a canister and angrily, joyfully, sprayed graffiti on the substation: pfft!" —Francesca Ferguson, Deutschlandscape.

"'Pfft, Pfft . . . Pfft, Pfft . . . Pfft, Pfft' was all that was heard during the next one and half seconds before the lights came back on." —Martin C. Arostegui, Twilight Warriors.

"Every spritz makes a pfft." —Wilhelm Genazino, The Shoe Tester of Frankfurt.