wash (someone's) mouth out (with soap)(redirected from Wash My Mouth Out With Soap)
Also found in: Acronyms.
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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!