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1.21 gigawatts 

Amount of electricity required to power the flux capacitor and get marty mcfly back to the future. since the appropriate nuclear material was unavailable in 1955, doc brown had to procure the necessary wattage via a lightning bolt.
1.21 gigawatts by daddy-ooooh March 26, 2009

jigawatt 

Unit of power used by a Flux-capicitor.
"1.21 Jigawatts ! The only thing that can produce that kind of energy is.. A bolt of lightning."
jigawatt by Woody Two Guns December 31, 2007

needs more jiggawatts 

A phrase from the film Back to the Future. It was used in the movie by the Doc to voice concern that something needs to be more powerful.

Today, we use the same phrase to explain that things need to be more powerful or better.
Jon: Dude, my MP3 player can't hold anymore songs. It's only 256MB.

Mike: Needs more jiggawatts.

____

Sam: This computer is too slow.

Judy: Needs more jiggawatts.

____

Mary: I bought a used Geo Metro. Needs more jiggawatts.

Beth: Hells yea.

____

Sam: How do you like these wings? I made them extra spicy.

Tony: Needs more jiggawatts!

gigawatts 

1.21, the number of gigawatts necessary to power a Flux Capacitor
I just had a 1.21 gigawatt flux capacitor installed in my car
gigawatts by Zeke April 13, 2004

jigawatt 

Gigawatt
See gigawatts.
"What the hell is a jigawatt!?"
jigawatt by Joshua J. Slone July 27, 2003
Incorrect pronounciation of the term gigawatt, said in the Back to the Future movie.
1.21 Jigowatts! 1.21 Jigowatts!
jigowatt by Billy Givens May 13, 2005