Top Definition
When two, or more (if there's a lot of chemistry) people's ideas combine to make another idea.
My friend and I were having some difficulty figuring out how to stop skipping class in the morning, so we decided to have some idea sex and out came a flawless idea. Just drop the class in the first place.
by The Marvelous Christian October 04, 2009
5 Words related to Idea Sex

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