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An old grade school prank. You'd write Pen 14 on your hand and walk up to an unsuspecting schoolmate and ask him if he wanted to join telling him he could be Pen 15. You'd then write Pen 15 on his hand, and everyone would laugh at him.
"I'm in the Pen club. I'm Pen 14, you can be Pen 15."
Pen 15 by Ritley August 24, 2003
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or Pen15. Resembles the word "penis" when written.
You are a gigantic Pen 15.
Pen 15 by webstersheir62 February 28, 2003
im in the pen 15 club
Pen 15 by jfkdl;sahg June 30, 2003
pen 15 is slang for penisalso see cock wang and dick
you wanna join the pen15 club?
Pen 15 by purplemonky November 11, 2003
Something your friends tell you to write on your arm. They Call it A "CLUB".

Its NOT!!!!!
Pen15
Guy:JOIN Pen 15

Me:..... OK!!!!!

*Writes Pen15*

HEY!!!!
Pen 15 by Ninoots! May 4, 2014
A club that unlocks the secrets of the universe.
“To join the ‘pen 15 club’ just write it on your wrist in sharpie
A way of typing penis so that it will get through language screens
*online* He is such a PEN 15
Pen 15 by IDIDATHING March 5, 2016