wash (someone's) mouth out (with soap)

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wash (someone's) mouth out (with soap)

To punish someone for using rude, vulgar, or obscene language by cleaning his or her mouth with soap (usually used merely as a threat). If you kids don't stop cussing in this house, I'm going to wash your mouths out with soap!
See also: mouth, out, wash
References in periodicals archive ?
Secondly, and this is something I just thought of, it is a lot more difficult to wash someone's mouth out with soap using one of those squirty moisturizing soap dispensers than it was using a fresh bar of Ivory.