Swip is most definitely not a real sound effect word, but it sounded cool. 8D
I ended up googling it out of boredom and it apparently stands for:

- Scottish Windows Investment Partnership or
- Sensor Web for Infrastructure Protection or
- Shared WhoIs Project or
- Society for Women in Philosophy or
- Software Improvement Program

... lol Jer's sword goes "Society for Women in Philosophy" when it misses.