slasher Syllabification: (slash·er)Pronunciation: /ˈslaSHər/Definition of slasher noun informal 1a person or thing that slashes. 2 (also slasher film or slasher movie, etc.) a horror movie, especially one in which victims (typically women or teenagers) are slashed with knives and razors. slasher in other Oxford dictionaries Definition of slasher in the British & World English dictionary