chemi-pen 

n. Permanent Marker/Texta. So called because of its strong chemical smell.

"Lend us a chemi pen, wouldya?"

chemi-pen by Rowena Beaton February 14, 2005

chem pen 

in reference to cheap pens when you disassemble them and the ink spills all over your paper.

Matt was so bored in class, he took apart his chem pens and flipped the ink cartridges across the room, splattering the floor with ink.

chem pen by Kiinoaeyy December 30, 2007