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A common 1980s-era mispronounciation of gigawatt, made infamous by Robert Zemeckis's "Back to the Future" trilogy.
"One point twenty one jiggawatts!"
jiggawatt by Ross M October 2, 2004

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! 1.21 gigawatts!!!
1.21 gigawatts by daddy-ooooh March 26, 2009
the street standard for judging the bass power level output of the the stereo system in a black mans car.
Man How many niggawatts do it take to get dat car to bump
niggawatt by S.Bennett July 16, 2008

niggawatts 

A corruption of jigawatt intended to indicate a quantity of energy approximately equal to the normal daily amount of work performed by an american black.
The amount of niggawatts being used to repair New Orleans is insufficient for long-term goals. The application of more nigawatts will be necessary if the city is to be rebuilt.
niggawatts by Robert Bopkin September 12, 2005
the amount of power expelled by a black person running away after stealing your bike
That guy produced enough niggawatts to power a small city.
niggawatt by stretch von stretch January 2, 2008

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!