A piefart is a popular word used in the porn industry. It is when two people are engaging in anal activity and one person creates a creampie in their partners butthole. Then that person with the creampie stands up and farts the creampie into the other persons mouth.
"oh my gosh Jim you totally just piefarted in me, it taste like banana cream pie."
by Robottricky October 19, 2008
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