A club that can only be joined by writing "I lovePen15" on your forearm.
Person 1: Hey! Are you in the club?
Person 2: What club?
Person 1: The pen15 club!
Person 2: Cool! How do I join?
Person 1: Just write "I lovePen15" in your arm!
Person 2: *Writes* Oh shit.
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.
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'.)
Caroline: What's PEN15?... OH FUCK!! YOU JUST WROTE PENIS ON MY ARM!!
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...