I remember hearing the band play it at the Lorient festival in Britanny in 1986. Jamie introduced it in fluent French - he lived in Britanny for a good few years - as " une histoire assez horrible". I can't remember the whole story, but somebody ends up in a pie - that would be your "cannibalism". I may well have a recording of it somewhere, I don't know if "Kornog's" first recording ever made it onto CD. May be worth checking "iTunes".
Regards, Kenny