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Wiktionary
mishegoss

n. (context slang English) madness; silliness.

WordNet
mishegoss

n. (Yiddish) craziness; senseless behavior or activity [syn: meshugaas, mishegaas]

Usage examples of "mishegoss".

One of you will either drive me into town where I can call the president of this mishegoss telephone company or I will urinate all over the kitchen.

He just took a little blood for his mishegoss laboratory and offered me some pills which I told him I'd throw down the toilet.