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Oh no, it was the classic mother BB gun block! Heh, heh. “You’ll shoot your eye out!” That deadly phrase uttered many times before by hundreds of mothers was not surmountable by any means known to kiddom.
— Ralphie · A Christmas Story

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker treats a mother's warning about shooting your eye out as an unbeatable roadblock, a phrase so deadly that no child has ever found a way past it. It's an exaggerated, mock-solemn description of a familiar parental veto.
Context reviewed