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2.
Someone who exposes their ass in front of enter and exit signs of businesses. By this action a shadow is cast upon the sign by the offending ass.
Did you see that AssShadow?

What are you doing tonight? We are going out to AssShadow.
by rogueleader12 March 10, 2009
 
1.
The untanned areas left behind because the shadow of your ass. Usually found as small triangles underneath the buttocks.
She obviously uses a tanning bed, you can see her ass shadow every time she bends over
by meredeer October 16, 2009