ktm is the abbreviation for "Kitemmuort" and its regional variants like Chitemmuort, Chitammuort, Chitammuorto, Kitemmuort, Kitammuort, Kitemmuorto, Kitammuorto.
Literally translates to "your deceased ones", similar to "mortacci tua".
ktm, being an abbreviation, is commonly found graffitied on
walls, akin to the usage of "800A" (SUCA) in Palermo. Kitemmuort is a versatile exclamation used in both
positive and negative contexts, insults, and as an emphatic expression.
"what does that «ktm» graffiti mean?"
"it means Kitemmuort"
"Mi hai fatto male! Kitemmuort!" (Insult: You
hurt me! Kitemmuort)
"
Che kitammuort e giornat." (Emphatic: What a challenging day!)
"All'anem e kitammuort." (Insult: Go to
hell, you and your deceased ones!)