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Jenious with the capital "J" is a dummie. A Jenious is a retard. Usually hangs out outside of the school doesn't go to class cause was so stupid that they didn't relize that Jenious is the opposite of genious.
Father- Son you are so fucken smart you must be a Jenious!
Son- Wow you are so cool dad.
Father- With a capital J buddy.
by Baby Dawn April 17, 2009
This word is using to describe any cool idea come up with the person name "Jeremy" or start with "J"
A:"Oh my god.. what a Jenious!!"

B:"Yeah..i know i am!!"
by Sharp Liao October 17, 2006