bottom water

Say your friend is washing an entity in the sink (such as their hands) we say that the water flowing through the entity towards the drain, bottom water.

*Jake is washing his hands in the kitchen sink, but I have already soaped mine up*
Me: Hey Jake, can I get some of that bottom water to wash my hands?
*Jake raises hands up to accommodate*
Jake: Yeah for sure you can use my bottom water, way to save water!

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