by Herb N. Dictionary 2011 August 23, 2011
A tanning bed side effect characterized by untanned spots on the ass, caused by lying in a position that causes the butt cheeks to squish together in such a way that it prevents the UV rays from tanning the entire region.
When I saw her naked for the first time I thought she had Vitiligo on her ass but it turns out it was just dark side of the moon.
by Herb N. Dictionary 2011 August 28, 2011