not have the foggiest idea

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not have the foggiest idea

To have no knowledge or understanding about something. He does not have the foggiest idea how hard it is to run a business. I do not have the foggiest idea where I left my car keys.
See also: foggy, have, idea, not
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

not have the foggiest idea

or

not have the foggiest

INFORMAL
COMMON If you do not have the foggiest idea or do not have the foggiest, you do not know anything at all about something. I did not have the foggiest idea what he meant. `How often does it need to be changed?' — `Haven't the foggiest.'
See also: foggy, have, idea, not
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
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