Moon Cricket

The slur is also used by some Native Americans against whites: "moon" as in pale, and "cricket" as in whites have big eyes and gangly legs. Whites also make annoying sounds like crickets.

See Cricket. Possibly derived from the "MC" often used after many black nicknames. Also a possible reference to the minoral aspect of the African race in the United States. A black person(cricket) in a sea of white(the moon).