(DUH-lee) - Noun - A Dullie is a Sharpie pen that has been used so much that the tip is all frazzled and will not write a smooth or fine line.
I've had this same Sharpie for almost 2 years, and I think it would now officially qualify as a Dullie.
by Bada Bing, Bada Boom October 09, 2013
"Why is he wearing that hat, looks dullie to me"
by JiM_DeAn May 13, 2007