A person you try to avoid due to their social awkwardness or annoying personality. Specifically, an acquaintance whose presence is unwanted, but is too nice or polite to be rejected outright.

Orig. a hypothetical bridge to the moon constructed of Coca-Cola bottles. One end anchored to the Moon, the other dragging along the surface of the Earth, this bridge would be something to run from.

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