duovigintillion

A number followed by 69 (nice) zeroes, or 10^69

Person 1: "Hey"
Person 2: "Hey"
Person 1: "You're so fat you weigh 139 duovigintillion pounds"
Person 2: ":("

10^10^10^56 CE

The year that the entropy of the universe following the heat death will cause a new Big Bang, resulting in a new universe, with more planets, stars, and other crap.

10^10^10^56 CE is when a new universe will be created.

unvigintillion

A number followed by 66 zeros

Example of usage:
Person 1: "Hey"
Person 2: "Hey"
Person 1: "Unvigintillion"
Person 2: "Ah yes, the number followed by 66 zeroes that is used commonly around the world"

An unvigintillion grams of stuff

c (light-speed)

c, or the speed of light, is the speed of which photons travel in a vacuum, A.K.A. the fastest speed in the universe.
To travel at/exceed this speed would result in breaking the fabric of space-time.
c = 299,792,458 meters per second = 671,000,000 miles per hour

The new spaceship, Exr-C2 can travel at 0.6 * c (light-speed), or 60% of the speed of light.

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