What do these lyrics from the song "IKO IKO" mean - " Jockamo feeno ai nané Jockamo fee nané "?

Can anybody answer this!?

The songs starts "My grandma and your grandma sititng by a fire"...

Then there's a chorus that I don't understand - " Jockamo feeno ai nané Jockamo fee nané "? - What does it mean?
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