go number one
euphemism To urinate. ("Number one" is a euphemism for urination.) I only have to go number one, so I won't be gone long. A: "Mommy, I have to go to the bathroom." B: "OK, sweetie. Do you have to go number one or number two?" You had a lot of juice this morning, so I think you should try to go number one before we leave the house, honey.
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