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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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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Someone might ask you to join their pen club, but they already have 14 members so you can become 'pen 15'. They will write this on your arm so it will be defined who you are! Never turn down someone who asks you to your pen club
"hey wanna join my pen club? youcan be 'Pen 15'!"
by Vinny Eoh April 10, 2019
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