A term used to desrcibe a towel that is attached to the end a long extendable stick. Commonly used to wipe sweat off hard-to-reach places around the body, particularly underneath folds of skin/fat.
(read in a female hill-billy accent)
"Hey Cleatis! C'mon over err and fetch your momma's sweat stick....."
(Cleatis walks over with the sweat stick and proceeds to wipe reluctantly)
"Oh yerrr, that's it, you wipe your momma's back."