A sudden "brilliant" realization that, upon reflection, turns out to be stupid (often immediately after you've shouted it out to everyone within earshot, or, worse, published it in a public forum).
"John had a really embarrassing epoophany in math class yesterday; he thought he'd figured out that all odd numbers were prime (because 3, 5, and 7 are) and tried to prove it in front of the whole class."
by Abrax March 28, 2008
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