A lyric from Rhianna's song N.E.R.D. Confusing, but might be a small mention of the case in Florida where a man on bath salts ate another mans face in a drugged craze.
Yo....man dont be doin bath salts. Bath salts bitin speakers in the face
Anytime a girl's makeup runs over her face due to tears or precipitation giving the appearance that she has been recently crying...most likely in a bathtub behind a locked door.