What is Ker-billion?
1.
A number nth times larger than any other number. Normally used to describe huge numbers in a funny sounding way.
Person A: "OMG, I just got laid like a ker-billion times!"
Person B: "lol, good for you."
Person A: "That Car costs a ker-billion dollars! I can't afford that!"
Person A: "Donald Trump has almost made a Ker-billion dollars in his lifetime."
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Its a filler word to explain an action, a movement or just a random saying to include in a story.  Sometimes its accompanied with hand m.. 
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Something that is ridiculous and shit at the same time.
'Holy shit, that shit be shitdiculous'
See shit, ridiculous, holy, c..