Prefix
In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10 (short scale billion or long scale milliard). Symbol: G
giga- + watt → gigawatt ("one billion watts")
(computing, sometimes proscribed) Multiplying the unit to which it is attached by 2 or 1,073,741,824.
Synonym: gibi-
(slang) Augmenting an adjective; intensely, extremely, or to an exceptionally high degree.
Synonyms: super-, supra-, hyper-, ultra-, uber-, mega-
Wow, I am giga-jealous right now.
(Internet slang, originally 4chan) Used to augment nouns; denoting an invididual who is a paragon of something.
giga- + Chad → gigachad
giga- + Stacy → gigastacy