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Pronunciation: sahy-azd

Shorthand for the phrase, "Stupid is as stupid does."

Often used to mock individuals for saying/doing dumb things.
Jacobo, Anthony, and Carlos walk by the science room.

Minutes later...

Carlos: Hey, we should go in the science room?
Anthony: We passed it like 5 minutes ago.
Carlos: Did we go in?

Jacobo and Anthony look at each other dumbfounded, and then stare back at Carlos.

Anthony and Jacobo: SIASD!
by Dr. Gresser Met Kurt Vonnegut February 08, 2021
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May 4 Word of the Day
A portmanteau of carpe diem, a Latin phrase that means “Seize the Day!” and DM, which stands for Direct Messages. This word means seizing the day via DMs.
Dude 1: Bro I just got Arnold Schwarzenegger’s number!
Dude 2: Carpe DM, bro, Carpe DM.
by LolWut098 December 30, 2020
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2
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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