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.
by ksmanning April 15, 2011
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