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Region: US | Usage example: He doesn’t know his backside from a tomato can when it comes to budgeting.

Doesn't know his backside from a tomato can

Meaning

Completely clueless about a subject.

Usage

Describes ignorance in a colorful, folksy way.

Origin & History

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

Frontier slang contrasting a clueless person with the obvious shelter of a tin can.

Found in Southwestern US newspapers and cowboy tales around 1900.

Related Idioms

Apple doesn't fall far from the tree

Children often resemble their parents, either in looks or behavior.

Pennies from heaven

Unexpected good luck or income.

Money doesn't grow on trees

Resources are limited; spend carefully.

More Idioms

Break the ice

To do or say something to relieve tension or get conversation going in a social situation.

Cut to the chase

Skip ahead to the most important or exciting part of something.

The ball is in your court

It is now your turn to take action or make a decision.

Throw in the towel

To concede defeat or admit a struggle isn't worth continuing.