prefix
In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁹ (short scale billion or long scale milliard).
(computing, sometimes proscribed) Multiplying the unit to which it is attached by 2³⁰ or 1,073,741,824.
(slang) Augmenting an adjective; intensely, extremely, or to an exceptionally high degree.
(Internet slang, originally 4chan) Used to augment nouns; denoting an invididual who is a paragon of something.