An article of clothing that is ejaculated in frequently, and washed rarely. It is easily hid or camouflaged amongst one's dirty clothes, and kept within an arm's length of the designated spank station.
"This dirty tube sock will make a fine Batch Rag for the next few weeks. I just hope my mom doesn't notice it's crunchiness when she throws it in the wash."
by Bonero69 July 15, 2013