I have raked my brain for an answer without success. I think you have either the spelling or the syntax wrong.
Guchana - to split into threads
Njane - has been split into threads
Iguru - up
goro - expensive
Njane guru - does not make sense when you replace 'guru' with either 'iguru' or 'goro'
Try to make a sentence in the context in which you heard - njane guru - and I will try again.