A plastic device used for navigating snow and icy terrain with great alacrity. It's kind of like the ghettoequivalent of a sled. Essentially it's a piece of plastic someone's ass goes on. Hence, it's an ass piece.
I broke my sled because I got distracted by a pair of frogs having sex by the lake. Now I am force to buy an asspiece instead due to my limited budget.
With all this ice one could easily slip. For this reason I navigate the hellish polar landscape upon my trusty asspiece.