Verb, to explain using to the lowest common demoninator. To make readily explainable to the average Walmart employee or customer. To "dumb down" an otherwise complex explanation, idea, or concept.
"You need to Walmart that report before presenting it"
A Walmarted explanation for basketball would read as follows: five guys try to throw a ball in the other five guys' basket.
"Gravity makes things fall down," Walmarted Isaac Newton.