One who speaks above his level of knowledge, experience or expertise. From Latin Ultra=above & beyond + crepis-idis=sole,keel.
The story goes that when the famous Greek painter Apellis made a full-body painting of Alexander the Great and showed it to the audience, a shoemaker approached him and made some comments about the rendering of the sandals of the great warrior. The painter promptly acknowledged the error and with a stroke of his brush corrected it. But after a while the same man started to comment about the robe of Alexander and the painter cut him short by saying, "Stick to the sandals, my valuable friend".
by John Prezanis July 21, 2003
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Expressing opinions on matters outside the scope of one's knowledge or expertise and wanting to announce your ignorance to the world.
Mohammad was an ultracrepidarian, just look at what he said about human reproduction.
by nina69 November 29, 2020
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the habit of giving opinions and advice on matters outside of one's knowledge.
Jen: Brad interrupted the conversation between Lisa and Jane about whether or not to have an epidural.

Sarah: Brad and his ultracrepidarianism gets on my GD nerves, he act like he has a uterus or something, what an asshole!
by Sunny Asylum July 28, 2011
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Meghan Markle on whatever latest trend she's hijacking for publicity.
Meghan Markle is an ultracrepidarian on almost every subject, except how to marry white men.
by Abcxyzee February 17, 2021
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Literally a fancy word for Karen

Ultracrepidarianism means that they give opinions on something that they don't even know

ok COME ON
HAVE YOU EVER MET AN ANTI-VAXXER THAT ACTUALLY HAS A DEGREE IN MEDICINE AND PUT TOGETHER A GOOD ARGUMENT ON WHY VACCINES CAUSE AUTISM

Yea i didn't think so have a nice day
Ultracrepidarianism = karen

and nothing you say will change my mind

UnU have a nice day
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