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gigadeath 

The cataclysmic death of a billion people or more. This is equivalent to one thousand megadeaths. This does not need to occur in a single event, but from a connected cause. This word was derived from "megadeath", which was coined in 1953 to describe the results of nuclear war. In contrast, "gigadeath" was coined to describe the more massive catastrophe of industrial civilization combined with peak oil, global warming, ecological degradation, and explosive population growth overshooting the global carrying capacity.
"Abrupt climate change would inevitably lead to gigadeath."

"Humans can live sustainably on this planet, but only after a few gigadeaths."
gigadeath by Gigady Death February 16, 2010

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

greasweaty 

Adj. having skin that is simultaneously greasy and sweaty, especially when the sweat beads up on the skin similarly to water on a duck’s back
After playing in that baseball game in the Texas summer heat, my penis and scrotum were so greasweaty!
After walking up 12 flights of stairs in that building, I looked in the mirror to find that my forehead was completely greasweaty!
greasweaty by El Quequito July 14, 2019

Gigasmatronic

Dr Brown's baby was 10lb 4.5oz, thats one gigasmatronic Brown baby
Gigasmatronic by Ally Dinsdale March 31, 2009

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

gigawatts 

1 billion watts. "Giga" follows "Mega".
Whoever wrote the first definition for gigawatt is a dumbass.
gigawatts by dammit janet June 19, 2003