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1.
Lemonade Mouth - n. - A cotton mouth like side effect experienced after having urine expelled into the mouth.
Man, I just came back from the Men's Bath House and I've got a terrible case of Lemonade Mouth.
by OxfordEnglishDictionaryRevised April 12, 2011
 
2.
Related to golden showers, lemonade mouth occurs when an individual's mouth is filled with urine either by their own doing or with the help of a partner. The resulting appearance is similar to that of having a mouthful of lemonade.
Shit man, that girl's a freak. After we finished screwing she begged me to give her lemonade mouth.
by Yensid April 10, 2011