n. the moment, typically with a toddler or small child, where all manic energy has been expended and seconds remain before a tantrum or nap occurs
Kid: "No thank you. I'm too tired for candy."
Mom: "Oh my, you've reached your exhaustion event horizon. Let's get you to bed."
Mom: "Oh my, you've reached your exhaustion event horizon. Let's get you to bed."
by FoxHart October 21, 2010
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