Misinterpretation of the term "tar balls" which are literally balls of tar. These are found along the coast of Hawaii. Jack Johnson is a surfer (from Hawaii)turned musician, hence the reference to a common item that you'd see when surfing.
"...her feet are all covered with tarboles and scars..." Bubble Toes by Jack Johnson
by C. Eric C. July 06, 2006
mis-interpretation of "tar balls" @see Jack Johnson's officail site
And her feet are infested with tar balls (not tarboles)
by JayFnG July 06, 2006