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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
1 someone who is a shit head and an idiot
Mr viger is a Shidiot
shidiot by Diamon March 2, 2005
A person that is part shit head and part idiot
That person is a Shidiot
Shidiot by mshadoe December 11, 2013
shidiot by Ohjin January 14, 2008
A contraction of "sun shade idiot", any person who puts their car sunshade in the front window even if the car is facing to the north (in the Northern Hemisphere- no evidence exists yet that this occurs in the Southern Hemisphere too).

Quite possibly they do it on purpose thinking that, even though it is daytime, the North Star is out there and it is bigger than the Sun. This excuse would not work in the Southern Hemisphere since they cannot see the North Star.
Three cars in the parking lot are evidently being driven by shadiots today.
shadiot by ksmanning May 5, 2011
Contraction of the words "Social, Media & Idiot", used to describe a person who posts on social media to their detriment, in such a way as to cause themselves to be embarrassed, discredited and even potentially arrested. Plural: Smediots.
Did you see how Andrew Tate's twitter posts led to his arrest? What a smediot!
Smediot by AngelEowyn January 7, 2023