not have the foggiest idea

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

not have the foggiest idea

or

not have the foggiest

INFORMALCOMMON 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