A Chairpit is when a group of people (mainly classmates) force a fellow peer in to the center of the room or a corner and the person is surrounded by chairs causing them to be trapped in a pit. This works most effectively when the supervisor is not present also, for an official "Chairpit" the victims peers must chant "Chairpit" repeatedly. This causes extreme humiliation and more enjoyable.
Note the chairs being used for the pit must exceed more than ten and they must be forced into the pit for it to be considered an official "Chairpit"
Put him in the Chairpit! Chairpit! Chairpit! Chairpit!