Panties worn by those interested in scatology, or scat
play, for the exclusive purpose of defecating in; a throwaway pair that can be disposed of after using for its intended fetishistic purpose, thus avoiding burdensome
cleaning.
(A portmanteau of "shit" and "panties".)
Knowing she was going to scat play later that
night, Cheryl put on her shanties in the morning, and had 3 cups of coffee, 2 and-a-half packs of cigarettes, a big lunch, and treated herself to Fiber One bars liberally throughout the
day.
Since my hemorrhoid surgery, I have been wearing shanties every
day, rather than ruin my silk Victoria's Secret.