out of (one's) cotton-picking mind

Completely crazy, irrational, or mentally unstable. "Cotton-picking" is used as an intensifier, usually to express frustration, exasperation, or disbelief. Primarily heard in US. I know my husband thought I was out of my cotton-picking mind to quit, but I just couldn't stay at that law firm a second longer. They're out of their cotton-picking minds if they think they can slip this past the federal authorities. Did you see the way he attacked them? He's out of his cotton-picking mind!