Not have a bean
Definition 1 of 1
Pro Tip 1/3Colloquial Usage
Used in casual conversation, not formal or official situations. 
When I last saw Jim, he mentioned he didn't have a bean.
Pro Tip 2/3British Slang
Specifically part of British English; may not be understood widely outside the UK. 
On my trip to London, everyone kept saying they hadn't got a bean.
Pro Tip 3/3Hyperbolic Expression
Often an exaggeration; unlikely someone has literally no money at all. 
I'd love to join you for dinner, but I don't have a bean this week.