| 1. | boo birds | ||
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The sound of disgust coming from a crowd at a sporting event after something they didn't like happens. The sports announcers reported, "That questionable call by the officials brings out the 'Boo Birds'."
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| 2. | boo birds | ||
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Home team fans at a sporting event who boos one or more members of the home team because of the team playing bad. The boo birds are out tonight.
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