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1.
A brainwave that hits you when completely intoxicated. Particularly prevalent in the advertising industry.

After my seventh gram of Columbian marching powder I had some seriously awesome hideas for the development of the new campaign!
door CapTim 22 november 2007
 
2.
refers to ideas or abstract thought processes that you experience when you are under the influence of cannabis.

high+idea = hidea
1: combining the breakfast and lunch menu at mcdonalds by timing your order right at the time of the menu change. hidea.
door gtangsta 10 maart 2010