A dumb person who is just beyond fucking dumb.
"Look at that fumbo trying to eat soup with a fork"
by BrandonMWX April 6, 2016
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Mixture of words that can not be explained based on how extraordinary something is
by Kingtenk August 7, 2018
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A person that is always fumbling and trembling.
You always trippin over yo big ass feet fumbo trembo
by Yo Skeet Skeet September 1, 2006
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A fusion between the words fucking dumbo, originating from some idiot on the internet who mispelled dumbo
"That kid is a fumbo
"
by Kamelowastaken October 9, 2021
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