Patricia from Ontario referred to Yoki and the Kaiser as "a 50's skipping game we played using elastics". She wrote: "I believe it was originally a Korean children's game and the children of missionaries brought it back to Canada in 1939. The words we sang as children here in Ontario were..."
Yoki and the Kaiser,
Yoki addy ay,
Yoki in the Kaiser,
Kick him in the so-po,
You can join a conversation about Yoki and the Kaiser on Mama Lisa's World Blog. There you'll find more info about the chant and additional versions of it.
Note: Some people think this chant came from a Japanese song.