PFFT is an expression of dismissal. It is sometimes used as an expression of lack of interest or a descriptive word for a sound that represents an abrupt sound like a slight explosion or impact. PFFT can stand for Pre-Corrected… Full Answer
It's not just in chat, it's every day language. It usually means disbelief and a bit of derision about oneself or someone else, or about something, as in "pfft, are you joking?", "pfft, that will never happen". Read it kinda… Full Answer
Pftt and pfft could be used to mean a sound of dismissal or a sound that you might make when you find something annoying. It might also be used to indicate that you do not believe something that is said.