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piss-up ***  n  (Brit) juerga  f  de borrachera 
IDIOMS he couldn't organize a piss-up in a brewery  no tiene ni pajolera idea de cómo organizar algo *  

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"Collins Spanish Dictionary 8th edition published in 2005 © William Collins Sons & Co Ltd 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005"