1. When ones belly button lint is removed from their navel cavity and placed into anothers. 2. May be transfer of belly button lint from person who produces excess fluff to someone with inadequate production. 3. A cruel procedure that is often done to an unwilling recipient by restraining their body.
John, "Wow, I have a whole lot of fluff accumulated in there" Bryce, "Harvest that shit for someone in need of a belly button lint transplant!"