1 definition by R Lord

to unexpectedly or suddenly hit someone or something in the mouth. Often done in anger or with the intent to injure. Almost always done with whatever is nearest at hand.
"I gobsmacked that bully with my biology book."
"Billy said he was not going to get off my new bike. I gobsmacked him into changing his mind with my book bag."
by R Lord February 08, 2008

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