An idea or insight a person has when they are high. For the duration of being high, it is a truly profound, original, and useful idea, but turns out the next day to make no sense, or be of any use whatsover.
Jimbo had an highdea last night that he was sure would make him a multi-millionalre. The next morning, however, he realized that no one would be interested in purchasing live ducks to wear as headwear.
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