When you poke someone in their hinder hole when they least expect it. Works best when an individual is under a table. The ensuing reactive jump from the "pooperpoke" should cause the victim to jump and drive their head into the bottom of the table.
I caught Joe under the desk picking up a pencil and I pooperpoked him. He now has a concussion.
by Long Duck Donger Jr. VIII October 20, 2013
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