I've understood the term to describe a situation where a cigar will burn much faster down one side and lead to an almost hollowed out look, much like the way a canoe is formed by burning out a hollow in a log. Of course if I'm wrong here, I am more than open to correction, but that is how I've understood it, essentially it would be a very severe burn issue that can lead to the cigar not being smokable.
Be careful if you explore the site i just linked to. There are a few bits of info that are wrong. (especially if you get to the point where they are talking about plume (bloom))
Comments
Joe
What he said. I've also heard it called tunneling.
http://tobacconistuniversity.org/faq/faq-inward-burn.asp
^^^^
what that link calls "inward burn" is what i thought tunneling was.
Be careful if you explore the site i just linked to. There are a few bits of info that are wrong. (especially if you get to the point where they are talking about plume (bloom))