not know beans about something
not know beans about (something)
To know nothing or next to nothing about something. Don't ask me! I don't know beans about car engines.
not know beans aboutknow nothing about. North American informal
2001 Hudson Review One tires of reading collections of prose by poets who may know their craft from holes in the ground but don't appear to know beans about anything else.
not know ˈbeans about something(American English, informal) know nothing about a subject: I really don’t know beans about economics.
not know beans (about something)
tv. to know nothing about something. Don’t pay any attention to her. She doesn’t know beans.