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Derived from "Smart Idiot." One of those annoying, over-educated, know-everything people that are armed with a bevy of useless facts. They are completely lacking in common sense and charisma. Usually found in their native habitats of Wall Street, or leadership positions in companies that go broke shortly thereafter.
Almost anyone that helped blow up Wall Street firms during the mortgage meltdown. Anyone that worked at Bear Stearns or Lehman brothers. In the movies, the Smidiot is usually an Eddie Haskell type character, a smarmy know-it-all.
Smidiot by Dasan November 23, 2009
A Shity mothafuckin idoit. smidoit.
JuJu:Girl I just gave ray ray head
KayKay:You A Fuckin Smidiot
smidiot by Bri Bri 12 December 8, 2006
direct translation: "smart idiot" this is used when you know of someone who is very intelligent but something causes them to act stupid at times.
John you're such an smidiot
smidiot by Marianne luigi January 18, 2021
Social Media Idiot - Someone who spends so much time on social media sites it effects their cognitive function.
If your main source of news is Snapchat, you're probably a Smidiot.
Smidiot by IAmNotSober November 30, 2021
A mixture of shithead and idiot. Often known for as being an insult, definately not a compliment, and NOT defined by the following person above/below/whatever, it was a common swear word my grandfather would say when driving on the road and running across a 'shidiot' who obviously didn't know what they were doing.
That stupid shidiot doesn't know how to drive! The light isn't going to get any greener, damnit!

I can't stand that asshole, he's a stupid shidiot.
shidiot by DeSiReDPaRaSiTe December 3, 2004
A quicker way of referring to someone as a stupid idiot.
That stidiot can't see the forrest through the trees.
stidiot by Bill M August 3, 2007