A 'sugar high' is nothing more than the brain manifesting an imaginary state of hyperactivity and a 'high' because the "user" expects there to be one, not because it's actually there.
John Doe: I've got a sugar high
Jane Doe: Dude, sugar high's don't exist..
by Fox1337 March 20, 2006

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The euphoria experienced after consuming large amounts of sugar or caffeine. The effects of sugar high are commonly exaggerated by people who compare it to the effects of pot, alcohol, and other drugs. These people are usually idiots. While sugar high exists, its effects are, in fact, really tame, and may include dizzyness, a bit of insomnia and nausea. It lastes for a couple minutes, or wears off after you take a shit/throw up.
I ate 5 candy bars and got a sugar high, I threw up and then I felt okay.
by castooor November 08, 2009

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Performing oral sex on a woman.
The term was made famous by the Movie "Empire Records", which starred "Coyote Shivers'" front man singing their infamous song: "Sugar High".
"I feel so funny deep inside when I lick between your thighs....that is asugar high". -Coyote Shivers
by Chris. A. H. November 30, 2006

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Dude, it happens wen u eat hella fuckin candy or just sugar(anything wit sugar works) and ur hella fuckin twitchy and shit. Unfortunately, it doesnt last very long. Only ppl who dont do drugs eat hella fuckin sugar to get high off of it.
After getting a sugar high, i was hella just sitting in the corner twitching until it wore off.
by cass February 07, 2004

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