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1. slang Foolish nonsense or untruthful rubbish. From Yiddish. Why, I've never heard such shmegegge in my entire life! Quit filling the kids' heads with that shmegegge about the dybbuk, Jerry. They're going to have nightmares for weeks!
2. slang An impudent, ignorant, oafish person. From Yiddish. I just don't understand why she ever married a shmegegge like him. Jeff is managing the project? That shmegegge couldn't manage his own sock drawer.