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1.
A moment of idiocy, generally caused by ignorance, confusion, ill-information or ditziness, causing the victim to make unintentionally comical statements and/or queries causing those within earshot to laugh and/or show concern for the ability of the victim to survive in the modern world.
Webster Moment: "How can the Welsh play for the British & Irish Lions?"

Webster Moment: "Do they have BT in Scotland?"
by H. MacDougall June 25, 2010