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A powerful hoodoo charm, usually a cloth bag filled with roots, herbs, minerals, goofer dust, etc. Does not actually refer to an actual hand, but to certain roots commonly used in mojo. Also called a gris-gris.
Going down to Louisiana to get me a mojo hand

from "Got My Mojo Workin'" Muddy Waters
by Dr. Badwrench November 25, 2006