Top Definition
Something very difficult. Based on the rescue from the Beaconsfield gold mine in Australia where the rescuers encountered rock said to be times harder than concrete.
That exam was five times harder than concrete.
by joseph diggler July 16, 2006

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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