not have a bean
Be destitute or penniless, as in He doesn't have a bean, but she's set on marrying him. Bean has been a slang term for a guinea or a sovereign coin since the early 1800s. The precise expression was first recorded in 1928.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.