Similar to a Walmart rat. Someone who could be defined as Walmart trash spends their time in a Walmart and loiters around there. Another definition for Walmart trash is a Walmart customer who looks shady or is doing weird or stupid things.

So basically, it means a lesser human being that dwells in Walmart.
I was at Walmart the other day buying some snacks, but then some Walmart trash came up to me and questioned my snack choices.
by whiteboyz36 October 27, 2017
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