Top Definition
The natural phenomenon that occurs when one enters any Wal-Mart Superstore needing nothing, yet somehow ends up leaving with a full cart.

This is probably due to their low costs, extended store hours, and poor employee benefits.

See: Wal-Mart
Victim: Dude, help me unload my cart.

Victim's Friend: I thought you said you didn't need anything?

Victim: ...They did it again! It's The Wal-Mart Effect, Gets me every time.

Victim's Friend: Ah, I see what you did there. Very well played, Wal-Mart.
by Justin121121 September 24, 2010

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