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When somebody (usually a child) shits in a swimming pool and the poo gets stuck in the overflow-gratings.
Lifeguard (during and announcement): "... and please watch out for the poo in the gratings, we stil haven't managed to wash it out yet... sorry! Just look out for the brown grids!..."
by Ibanezdudecons January 25, 2009

Words related to Brown Grid

gratings overflow poo pool shit swimming