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1. A short, cylindrical piece of jewelry that is fitted to one's earlobe, stretching it in such a way as to create a visible opening through the flesh. I'm in support of all forms of body modification, but the thought of getting an ear tunnel still gives me the willies.
2. The visible opening through the flesh of the earlobe that results from such a piercing. I think she tried to stretch her ear tunnel too fast, and now it's pretty badly infected.