"Feeling bad, Gross" is "밥맛이야"(pam-ma-shi-ya) in Korean.
The 밥맛 (bab mat) is compound word of 밥 (rice) + 맛 (taste) = but it means that the rice of taste, it is used in the sense of feeling bad, Gross in slang. 이야 is (Is). It is also called as 재수없다 (Jae su op da).