this is what a person does when they are in the middle of preparing a large leg of lamb for a lavish family dinner, often including in-laws. What they do is remove the bone with an inappropriately long knife for the job, creating a cavity within the meat. Once that is done, the person then pulls his trousers down and gleefully slides his privates into the cavity- thus tunnel boning the leg of lamb.

When you eat dirt for the first time and leave your family to build a shack in the woods