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A flat attitude comes from the A Bad Attitude is like a Flat Tire quote. A bad attitude from a person who can't let something go, no matter how long ago or truthful it really is.
Person 1: Taylor Swift's had such a flat attitude in her acceptence speech at the Grammys.
Person 2: Yeah. Wasn't the whole feud between Kanye and her years ago?
by AnAverageGrammarNazi September 10, 2016
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