An acronym which is short for "peanut fucking ass head"
When Paul got annoyed at being referred to as "Peanut Head" , he blurted out: "yeah- that's my name, peanut fucking ass head". It was eventually shortened to the acronym "PFAH"
An utterance indicating disgust or disregard for an idea or something said by others.
"Seriously? You care what he thinks of you? Pfah."