A colloquialism for toilet paper used almost exclusively by men of the blue collar persuasion. The word enjoyed widespread use in Southeastern Ontario during the latter half of the 20th century, before being systematically suppressed in the late 1990's and early 2000's by the emerging Politically Correct movement. It can, however, still be heard from time to time in public bathrooms around the greater Kingston Ontario area, usually uttered in a gruff tone of voice.
Hey bud, you got any shitwinder in that stall? Some asswipe used it all up over here.