A new trend started by theamazingatheist, a well known YouTuber that makes videos criticizing and parodying random people that he finds dumb.
To blueberry pie someone is as similar as getting ricked rolled, only instead of seeing Rick Ashely singing to Never Gonna Give You Up, we see theamazingatheists singing to randomly thought up tune while constantly repeating "blueberry pie".
Sasuke: oh look! Naruto send me a video! Wonder what it is...
*Sees the video*
Sasuke: Damn it! He blueberry pie'd! me!