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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."
by Ritley August 24, 2003
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Exclusive club for those in 6th and 7th grade. Only requirement to enter is to have the club's name written on one's body part, such as an arm or hand.
Johnny, join the Pen 15 club! Alls ya need to do is let me write Pen 15 on your arm.
by MoonKnight November 25, 2002
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A mock spelling of the word penis. Can be used to trick ones friend.Mostly Done by children in the 5th or 6th grade.
Hey Mat you wanna join the Pen15 club? Just let me write Pen15 onyour hand
by Lincoln Barltett February 09, 2003
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Something that people at the age of 12 or under write on one's body part. It is the ritual in which to get into the PEN15 club, if u write it the correct way, the 1 looks like an I and the 5 looks like an S, so instead of looking like pen with 15 latched onto the end, it spells out PENIS.
Lynn: Wanna join a club?
Caroline: Sure! what club?
Lynn: The PEN15 club! here, this is what it is!

(Lynn writes on Caroline's arm 'PEN15'.)

Lynn: Haha, Sara showed me!

Caroline: you mean Sara from 6th grade? you talked to someone in the grade ahead of us?
Lynn: yeah, she wrote it on my arm first...
by Valerie Mann December 30, 2010
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A word that, when handwritten, resembles penis. Write on someone's hand and good times will follow.
If you want to joing the pen15 club, you have to let me write it on your hand.
by Anonymous November 23, 2002
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Word that looks like penis when written out. Dumbass 12 year olds use it to trick each other.
Join the pen15 club. Here, lemme write it on your arm.
by mcnuggetdestroyer November 27, 2017
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