Meaning to chat or gossip
After lunch time, we often chew the fat.
to not know or understand something at all
I didn't have the foggiest idea what he was talking about.
(informal, C2) used to emphasize that you do not know something
"Is she going to stay?" - "I haven't have the faintest idea."
I don't have the faintest idea what you're talking about.
Neither of them had the faintest idea of how to be a parent.
As to what I'm going to do now, I haven't the faintest idea.
I don't think Steve had the faintest idea about what was happening around him.
(B1) to be similar to, and make someone think of, something or someone else
I never wear grey because it reminds me of my old school uniform.
You remind me of someone I used to know.
I liked her immediately because she reminds me of Sally.
He reminds me of my dad.
Something about her manner reminds me of an old school teacher I used to have.