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1.
When someone pays as little money possible for an item, and expects the item to be of the highest quality.
George: I went to wal-mart yesterday and got an amazing deal on this, but the first time I used it the thing broke. Doctor?

Doctor: Ah yes, I have seen this before. You have a condition known as Wal-Mart Syndrome. The cure is simple, shop somewhere else.
by Mr. Ko-Ray May 12, 2011
 
2.
Habitually going to Walmart and spending money on things that you don't really need: dvds, cds, video games, etc. Often times it occurs due to boredom.
"Yesterday I went to Walmart and bought a dvd for no apparent reason. I think I might have Walmart Syndrome."
by Blueboy57 September 12, 2008