not have the foggiest notion

not have the foggiest notion

To have no knowledge or understanding about something. He doesn't have the foggiest notion how hard it is to run a business. A: "Do you know where the car keys are?" B: "I don't have the foggiest notion. Sorry."

See also: foggy, have, not, notion

Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.