a long one - A thousand pounds in your pocket, but only if you’re rich an

A thousand pounds in your pocket, but only if you’re rich and lucky. Otherwise, it’s just a fancy way of saying you’re broke.

'He said he had a long one, but I think he just borrowed the money.'

'A thousand pounds is a long one, if you can afford it.'

'She said she had a long one, but I saw her eating ramen.'