An exlamation of disbelief
Joe-"I won the lottery!!"
Me-"Pft! Yeah right."
A sound made when you could really care less about the subject mentioned but don't want to verbally express how you feel.
Pft.
the noise my dog makes when he farts
suddenly i heard my dog's rump go 'pffffftt'
Comptuer text talk for - Please Fucking Tell
Boy: You are ugly
Girl: pft why you said that to me
used when feeling random.
usually caused by someone.
"Are you cool?" - Jamie
"Yes? pft." - Susie