mammt Share definition Flag It's an insult in napolitan dialect that can be translated in "Your Mother". It's usually matched with sex allusions in front of the word. "Mocc a mammt" (Dick in mouth) "Ngul a mammt" (Anal sex) "m facc a mammt" (I make sex with you mother) mammt by xBaffo August 5, 2017 Get the mammt mug.