As interjections the difference between phfft and pfft
is that phfft is while pfft is used to signify a sudden ending or disappearance.
pfft
English
Interjection
(
en interjection)
Used to signify a sudden ending or disappearance
Used to signify sarcasm or disagreement
(lb) Used to signify a puffing sound
Quotations
* 1965 Peter De Vries — Let Me Count the Ways
*: You'd never forgive yourself — and then you'd never forgive me, and then pfft , the end of a fine friendship.