Occurs when someone of dark complexion is situated between two people of light/pale complexion, and the two pale people are in a relationship. Not only will the darker person be third-wheeling, but they will be an "inverted wagon wheel," and they will be "inverse wagon wheeling."
The "wagon wheel" part refers to the wagon wheel snackfood similar to an oreo available in many parts of the world.
Black Guy: Oh hey, it's a white couple
(black guy runs up in between the couple, proceeds to make things awkward)
White couple: Stop being an inverted wagon wheel man