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full of it

1

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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2

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.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.