Insult. Often described as the worst insult around, if someone uses it the reciever has been known to pass out with lyrical shock.
First heard used by the MC: Devilman against Skepta in lord of the mic 2.
person 1: your rhymes are swag. KMT
Person 2: o yeah?, well I sold you an ounce of skunk, and you thought it was a four and a half.
Person one passes out.