shredder

Short definition from Wiktionary

Noun

1. 1
   A person who shreds or tears something.
2. 2
   A machine that tears up objects into smaller pieces, especially a paper shredder, garbage shredder or gardening or farming shredder.
3. 3
   A program that overwrites deleted data to prevent recovery.
4. 4
   Someone who snowboards; a snowboarder.
5. 5
   One who shreds, or plays (especially the guitar) very fast.