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!..."
See
Random Words:
1.
An acient crystal, which was placed in the caverns of the moon below a palace milleniums ago. It most recently existed as a power source..