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1. Amount of energy you save.

2. A vocal response often used in an ethnic neighborhood expressing disbelief or criticism.
1. The high efficiency washer will give you 100 negawatts.

2. "Yo I got us tickets to a country music concert." "Nega watt??"
negawatt by czjd March 14, 2013

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
a unit of energy saved as a result of conservation measures, such as reducing the use of heat or electricity.
Person 1: uhhh... I li-like little kids
Person 2: NEGAWATT, NEGAWATTT
Negawatt by rohaan's father October 4, 2023
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