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1.
Adjective; an English term to describe something that is unfavorable.
"that phone is pie out"
by Jay McGregor March 29, 2008
 
2.
To stand someone up, to give up on plans.
I was going to meet Liam for dinner, but he pied out on me.
I'm too tired to go anywhere. I am going to have to pie out and go home.
by Cookieknits March 13, 2013