slasher

noun7

1. •
   One who slashes.
2. •
   (informal) A horror movie with graphic blood and violence; a slasher movie.
3. •
   One who self-injures by cutting.

   • […] an overdoser, binge drinker, slasher, or sexually impulsive person, is found to act impulsively following some sort of change in a relationship. — 1992
4. •
   A murderer in such a film.
5. •
   (slang) One who writes slash fiction and/or supports male/male ships.

   • With the success of the first film and the third one already in production, Warner Bros. is more likely to greet Harry Potter slashers with more takedown orders than tolerance. — 2002
6. •
   A tool for cutting undergrowth.
7. •
   A machine for applying size to warp yarns.

noun1

1. •
   (UK, slang) A member of the 28th (North Gloucestershire) Regiment of Foot.