Someone or something that is ignorant or worthless to the point of having no value. Also one who displays the fact that they have no common sense or knowledge in a subject.
Fuck, that bitch is dumb as shit.

Really, that game is dumb as shit.
by Anonymous October 13, 2003
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A complete idiot. Seeing as shit doesn't have a brain, the person being compared to it could be called a mindless moron.
(online gaming)
Player 1: OmFg i am so gosu i just pwned the newbs!11!! 1337 h4x0rz!!1 ^^
Player 2: Stfu man you're dumb as shit.
by grab October 11, 2003
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a compound adj. to describe a noun
My teacher is dumb as shit.
My computer is dumb as shit.
This movie is dumb as shit.
by Drunk monkey October 12, 2003
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very dumb
That boy is dumb as shit.
by Joe Bloggs October 13, 2003
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Having the brain-capacity and memory-span of a pile of fecal matter.
M'lady, I do believe your son Henry is growing up to be quite as dumb as shit.
by Bastardized Bottomburp October 11, 2003
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