What you heard said in the sense of "Are you satisfied now?" is probably 이제 속이 시원해? This is a common phrase for "Are you satisfied/happy now?" or "Do you feel good now?", and is often a sarcasm. 시원하다 can mean "comfortably crisp and cool" (시원한 산들바람), "free and unencumbered"(앓던 이 뺀 것처럼 시원하다), or "feel satisfied, happy, or vindicated" (속이 시원하다). So it literally means your inside/guts(속이) feel good/comfortable(시원하다), which is to say you feel as good as can be.

이제 만족해! is "are you satisfied?!" 이제 속의 ....??? is "Now inside ....". You're going to have to give more context on the second one.

I guess It's usually from Korean drama. It is hard to explain. This expression can be used between man and woman. You can say it when you revenge someone by ruin yourself deliverately or to ruin youself in order to hurt another who might love you feeling. 상대방에게 상처를 주기 위해 자신의 인생을 일부러 망치는 것