To be extremely annoyed or angry.
Coming from the combination of Dicked - meaning something that was unfair or screwed over i.e. that was dicked. And out - meaning an extreme amount of something i.e. that girl was all decked out from head to toe in purple clothing.
To be extremely annoyed or angry because you felt something unfair or uncalled for happened to you. Coming from the combination of Dicked - meaning something that was unfair i.e. that was "dicked"; and Out - meaning to go to an extreme i.e. the girl got all decked "out"