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1.
1)A classroom riot, whereby pens are feverently thrown about the room, often at somebody.

2)As 1, but involving a fat semi-naked maths teacher grabbing fistfuls of pens and rubbing them on himself, often with loud, cheesy disco music and/or a mirrorball.

3)Any celebration of this sort
When I shouted PenFest, I had no idea that Mr Munro would burst in and rip his shirt off!!!
by Toryboy February 23, 2006
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