1) Adj. Response when you are happy, but surprised or shocked by what was said.
2) Adj. Response to an insult. Often said by sassy
african american women on Jerry Springer etc.
tv show host: you've just won a years supply of Snack Packs
Fat guy: shut-your-mouth
2) Some chick: You stole my man? You dirty scank
Sassy chick: You shut your mouth! He dont want you no more. MmmHmm (followed by clicking fingers from side to side)