What is Peeshaw?
1.
When something is hard to believe.
When you disagree with something someone is doing or saying.
"I heard that Jenny was going with Mark to the social."
"Peeshaw, he asked Mary like a month ago."
See
2.
a word used to show emotion such as excitement, understanding, frustration, or anger. To add extra meaning one could add Da Beeshaw and the end.
"Do you understand whats going on Timmy?"
"Peeshaw"
or
"Timmy, your dog died"
"OH! Peshaw da Beeshaw!"
See