corn ball
corn ball {n.}, {slang}, {informal}
1. A superficially sentimental movie or musical in which the word "love" is mentioned too often; a theatrical performance that is trivially sentimental.
That movie last night was a corn hall.
2. A person who behaves in a superficially sentimental manner or likes performances portraying such behavior.
Suzie can't stand Joe; she thinks he's a corn ball.
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Source: A Dictionary of American Idioms