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It is when you have been on an all day drinking binge, with all the trimmings. i.e. : 12 pints of strong larger at lunch time, an afternoon curry followed by more larger in the evening, topped off by a kebab with extra chili sauce, then straight home to bed. In the morning when emptying your bowls you will feel like you have shit a kidney ! And probably would have done !
God, i just shit a kidney ! answer, oh, have you just had a shidney ?
by Dungeon masters aprentice November 25, 2010
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When you are just about to get the flu and your back hurts in the kidney region, feels like your kidneys are full of shit.
mom-"get up and go to school"
me-"nah mah, got the shidneys"
by Carman MacDonald January 29, 2008
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