Aka - The 'Jeff Goldblum Noise'. The phonetic spelling of that sound made by actor Jeff Goldblum to punctuate every other sentence he utters. A kind of smug, smirking exhalation through one's splayed nostrils, which makes the user appear superior yet self-depreciating at the same time.
"Holsten Pills... pffftt... Because all the sugar turns to alcohol!"
"You could tell that Jurassic Park 3 was going to suck ass because... pffftt... they couldn't even get an old whore like me to be in it."