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1.
When two people pushing shopping carts in a department or grocery store are travelling towards one another and accidentally mirror one-anothers attempts to avoid the other person, typically ending in a head on collision.
"I was just trying to get to the frozen foods section and I ended up in a game of shopping cart chicken with some crazy old lady. I think I have whiplash!"
by The Trouser Snake Strangler April 27, 2010