When you pick all the boogers out of your nose and create a ball. Once you created the ball you would then throw it at a elders window yelling "YOU GOT BOOGENTASHED!"
Marty: Whatcha doing there Jeff?
Jeff: Oh, nothing Just making a Boogentasher.
Old Lady: Damn kids and there Boogentashers!
Old Man: I hate the Boogentasher tricks! Cleaning the windows is now a really dirty job!