Indian sign

[Indian sign] {n.}, {informal} A magic spell that is thought tobring bad luck; curse; jinx; hoo-doo. - Used with "the", usually after"have" or "with"; and often used in a joking way.

Bill is a goodplayer, but Ted has the Indian sign on him and always beats him.

Father says that he always wins our checker games because he has putthe Indian sign on me, but I think he is joking.