not have the slightest idea

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not have the slightest idea

To be completely unaware of or know no information about something. A: "Is Sally off today?" B: "Oh, I don't have the slightest idea. Ask Elaine, she'll know."
See also: have, idea, not, slight
References in periodicals archive ?
(http://au.ibtimes.com/articles/559652/20140720/floyd-mayweather-sorry-ufc-ronda-rousey.htm) Floyd Mayweather Says Sorry to UFC's Ronda Rousey After Not Having the Slightest Idea Who She Was
"Not having the slightest idea about how to respond, I simply replied, "Sergeant, you are a GO at this station."
Everyone stands around celebrating while the subject of the party sits there gurgling and not having the slightest idea what the hell is going on.
One of them for making absolutely no attempt to win it, the other for not having the slightest idea how to.
The term's success is due in no small part to most Americans' not having the slightest idea what's in Obama's health-care package or how it might make their life better.
I sat and talked to her not having the slightest idea I was talking to a famous person."
On the other hand, I do get the occasional lapse of memory, though it's usually to do with things such as running out to the garage to fetch something then not having the slightest idea what for when I get there.