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."
by Ritley August 24, 2003
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PENIS!!!!!!!!
Elmo yelled who wants to see my giant red furry juicy peary PENIS!!!!!!!! PENIS Pen 15
by PenisCockLover69420 January 21, 2017
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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!!!!
by Ninoots! March 25, 2014
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A club that unlocks the secrets of the universe.
β€œTo join the β€˜pen 15 club’ just write it on your wrist in sharpie”
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