Seeming to come out of nowhere, a jigowatt is the feeling of a what seems like a thousand bolts of energy shooting up the spine, wreaking havoc on your nervous system, completely disabling you from doing anything other than jerking your body in a violent shiver for about 3 to 5 seconds.
I was standing on my porch today when out of nowhere, I had a jigowatt! It was no ordinary shiver! It was like an earthquake went up my spine!
Misspronounciation of the Gigawatt measurement of energy, most famously used in the film Back To The Future (1985) in a discussion between Doc Brown and Marty McFly on the subject of powering the doctor's freaking awesome DeLorean.