Top Definition
an action in which a person is perfectly fine then they suddenly become very hyper for no apparent reason and they cannot stop talking and then they suddenly become incredibly tired all in a short period of time.
Girl: So what are you doing today?
Boy: Nothing.
Girl: hahahahahaha! REALLY?! wow wooooooooooooooooooo!!! *starts jumping around*
Boy:....are you ok?
Girl: whoa.....im tired...
Boy: i think you just had a hyperspark.
by Dougall June 30, 2005

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