A pen that is usually a fun, out of the ordinary pen color. They are wet when you first write with them but once the ink dries they are amazing. Some come with a hint of sparlke in them so the ink turns out shimmery. Elementary school teachers like to grade papers with them. Little kids go crazy over them. They make anything look more exciting to read and they can write on black paper and look snazzy.
"is that a jell pen?"
"heck yes its a jell pen, why do you think i got an A on my report?"
"woww. i need to get some of those!"