Adj, meaning Ugly, Disgusting anything bad is INDEED MUK
Ex.1
Kenneth: Ayo, you hittin that ?
Alvin: Nah bruh she MUK
Ex.2
Kenneth: What'd you think of the food
Amani: The chicken was cold and the rice was MUK and dry
Ex.3
Kenneth: Those are fire huh ?
Tehya: All I see is MUK