Thank you for this. I had been going to ask. I can imagine how it could have become derogatory over here though. Here we have the expression "too clever by half", and knowledge is not cool. Here also we have a reaction to people who use expressions picked up in US business contexts to show their superior knowledge, and this word combines those two attitudes. It was sitting alongside "suits" as metaphor for those who wear them in my mind.

Now I know better. Thanks.

Penny