Top Definition
Ratchet, Mood, Swing, Bitch
A R.M.S.B is someone that has ratchet mood swings, and their a bitch. For example there all fine then u get them angry, then they will go Sharkeisha on some niggas ass.
Iesha: Have you seen Bonquisha today.
Tenesha: Nahh bruu. But I heard shes been acting like a R.M.S.B
by Iesha.Thompson April 16, 2014

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