A noun, sometimes spelled dirt-dirt, referring to a Backwoods, Hillbilly, Hick, Hayseed, or a Redneck. The word is derived from the way they sound when they talk "Dirdie-dirt-dirt-dirt". It is often pronounced in the accent of a Redneck.
"Man, that guy's a dert-dert" "He was going on about his pickup truck like a real dert-dert"
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Word used to express stupidity. Best used in a Valley girl voice. Can also be used as just Dert.
Girl 1: Oh shit! I spilled my coke!
Girl 2: Ha! Dert dert.
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Slang word for retard or retarded
Ms. Singleton called her second grade students dert derts.
Now she is a real dert dert for that one because she lost her job.