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Also, full of the devil. Mischievous, naughty. For example, The youngsters were full of it today, giving the teacher a hard time, or Bill is full of the devil, hiding his roommate's clothes and teasing him mercilessly.
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Talking nonsense, as in He claims to have fixed the dock, but I think he's full of it . This usage is a euphemism for ruder idioms like full of crap
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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