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The taste of semen in your mouth after your friend got head from a girl and you hooked up with her after.
Corry: Ew, why does my mouth taste so salty?
Biga: LAL! You got the salty mouth bitch!
by Sir Miles May 26, 2009
To be proven wrong, to be dissed, or embarrassed!

The answer was C not B, salty mouth!
by LaKeisha Martin November 11, 2007