Dumber than a Bucket of Dogshit

Someone who is dumber than dogshit - their brain is the equivalent of a bucket...FULL of dogshit. While probably also morally inept/retarded, their intelligence is likely due to inbreeding somewhere in the family tree, or possibly being tossed into a ceiling fan as an infant. They usually turn into a screeching autist when triggered for an illogical reason.

Alternative phrase: "Uglier than a bucket of dogshit".

"All these politicians are dumber than a bucket of dogshit. I would rather have a bucket of literal-fucking-dogshit 'lead' me than these political assclowns."

"A bag of hammers, a box of rocks, and a bucket of dogshit -combined- have more intelligence than that fuckfaced douchefag."