Top Definition
Pronounced: (sea-asd)
A term loosely defined as "stupid is as stupid does". Despite this apparently obvious explanation, the full usage and depth of meaning cannot be achieved with the English language, the profundity of which is as limitted as the people this word attempts to describe.
Georgia High School Graduation Test
3/20/2007
SIASD

or

"Mr. Armstrong, why were they called the Planes Indians?"
"SIASD, son."
by Icarus_on_Fire March 29, 2007

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