not have two cents, pennies, brain cells, etc. to rub togetheridiomPart ofrubnot have two cents, pennies, brain cells, etc. to rub togethernot have two cents, pennies, brain cells, etc. to rub together — idiomidiom1. To be extremely poor or unintelligent.1.idiomDefinitionTo be extremely poor or unintelligent.ExampleAfter losing his job, Tom didn't have two pennies to rub together.Maya doesn't have two brain cells to rub together, but she's kind.