"Kee-mo-sah-bee" according to a wiki article, may have come from the Ottowa tribe of Native American "Indians" word for scout:
"Jim Jewell, director of The Lone Ranger from 1933 to 1939, took the phrase from Kamp Kee-Mo Sah-Bee, a boys' camp on Mullett Lake established by Charles W. Yeager (Jewell's father-in-law) in 1916."
"Yeager himself probably took the term from Ernest Thompson Seton, one of the founders of the Boy Scouts of America, who had given the meaning "scout runner" to Kee-mo-sah'-bee in his 1912 book "The Book of Woodcraft and Indian Lore"."
"Kamp Kee-Mo Sah-Bee was in an area inhabited by the Ottawa, who spoke a dialect of Ojibwe. John D. Nichols and Earl Nyholm's A Concise Dictionary of Minnesota Ojibwe defines the Ojibwe word giimoozaabi as "he peeks" (and, in theory, "he who peeks"), making use of the prefix giimoo(j)-, "secretly"; Rob Malouf, now an associate professor of linguistics at San Diego State University, suggested that "giimoozaabi" may indeed have also meant scout (i.e., "one who sneaks")."