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When you are trying to think of a word but your mind locks on to a similar word preventing you from remembering the desired word.
Chuck - "We had some of those New Orleans pastry things - oh, darn, I had it on the tip of my tongue but now all I can think of is 'bidet' and I know that's not it."

Carol - "Bidet!? It's a beignet - You don't eat a bidet you goof!"

Chuck - "I know, I know - I said that's not it - I had word lock."
by da Chetster August 12, 2012
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