not used anymore. another way to describe someone having an erection. It was usually said as “ej pen” for short. The word portrays “epipen”
A Prison Pen is a form of improvised writing instrument, which is achieved when one defecates just enough to extend past the buttocks and holds it there. The extended fecal matter is then used as a writing device in a manner similar to that of a mechanical pencil.
Person 1: Our boat is destroyed! How are we going to send an SOS?
Person 2: well there's a large rock face over there, we could use our Prison Pens
Person 1: I hate you so f**king much. If we starve I'm eating you first.