What happens to one when riding in a fast car with a friend and you get so scared you squeeze the apolstery from the seat between your butt cheeks thus having apolstery crack as the end result.
He was driving so fast that the girl in the back seat clenched her butt cheeks together so hard she got apolstery crack.
by Nightvision September 19, 2007
Get the apolstery crackmug.