What is Brown Grid?
1.
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!..."
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Random Words:
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1.
When one takes a grimy, big, fat, splattery shit diarrhea dump in a toilet, and then gives a swirly to another person in that same toile..