In the St. Louis cemetary people draw X's on LeVeux' grave, based on a rumor started by a women's magazine many years ago. There is no magical or traditional basis for the X's, and in fact it has damaged the grave site over the years. There are genuine voodoo ceremonies performed there, but these do not damage the grave site. However, the word spread through anthropological use to mean such people of any nationality.
Shamanism means something different to each person who uses the title.
Generally, shamans are thought to be practiced in herbalism and have a special connection with the spirits. Shamanic journeys are taken though the mind - meditation, drugs, etc. Shamans are thought of as healers, and as being in touch with nature. Shamans are generally spiritual leaders, sometimes feared and often revered by the tribe. Many Native American magics are known as shamanism, but this is not a correct definition of the term.