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Expression used when someone dies doing something stupid. Can alternatively be used for the deaths of people deemed unworthy of reproduction.

Likens the dead to microbes in a metaphorical gene pool, chlorine being a chemical used to kill microbes in actual pools.
“Did you hear about the robber who got killed robbing a 7-Eleven with a fake gun?” “More chlorine in the gene pool, huh”
by Simpsmasher January 10, 2021
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