A Mississippi bird bath is a term used in slang, and it has different meanings according to the sources. However, all of them are vulgar and inappropriate. According to the Urban Dictionary, , and, a Mississippi bird bath is the act of defecating in someones mouth and then dipping ones testicles in it. Another definition from Definithing and Slang Define describes it as filling a southern girls mouth with Kool-Aid, making her get on her knees with her mouth open while you dip your balls in it. It is important to note that these definitions are vulgar and offensive, and it is not recommended to use them in any context.