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An expression of anguish when one "screws up" or a mistake of great proportions.
Sam: Dude, that's not the answer...
by velvety1967 March 28, 2011
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Failing incredibly at something like a task; or what you hear after you 'bout to be kicked in yo' behind
Son: *Watching
Father: *Breaks in* *gasp* SON, U DUN GOOFED
Son: *Gets a big spanking*
by Jenndar-Da-Man June 07, 2017
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so, when you dun goof, you screw up in a REALLY BAD way, like getting caught with your gf/bf under the stairwell, or blowing up a gas can thinking it was empty
you just dun-goofed REAL bad timmy!
via giphy
by ConorMackGeGoryator November 23, 2018
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When a person fails at something or outright does something dumb and regrets it.
I crashed my car! I dun goofed.
You dun goofed.
by hman1223 May 29, 2018
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