To bring up one's accomplishments in conversation and contextualize them as a harrowing burden or the product of an accident or fluke.
Peter was telling me that he has four job offers, but he doesn't know how it happened because he's "dumber than an unfrozen cavemen." I wish that dude would just own up to his accomplishments, I'm tired of his humblebrag routine.
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."