1: The unexplainable need to go to the bathroom when shopping at Wal-Mart. It always occurs when you are furthest from the bathrooms. The Wal-Mart crap is not unique to Wal-Mart alone. It is also known as the Home Depot crap, Target Crap, etc.
2: Also a term to describe the cheap and inferior nature of goods purchased at Wal-Mart.
Dude, I was in the sporting goods department, concentrating too hard on the fishing tackle, and the Wal-Mart crap struck me!