Some people think:
1. Dispatch from the youth: a “penjamin” originally referred to a marijuana vape pen shaped like an actual pen to disguise what it is, but is now just any marijuana vaping device.
2. It's just a nickname for a vape, like "Penny and the Jets", "Lockheed Martpen", "Frankpen Roosevelt", etc
3. They’re just just called pens because they look vaguely like a pen.
4. The Penjamin pen is a discreet 510 threaded battery made for your cartridges! This design allows you to write with the pen but also take rips wherever you choose without anyone knowing or asking for aroma! How does it work? To write, screw the bottom part of the pen in a counterclockwise direction.