I found this extract from Wikipedia on the term:
So does anyone care to take a punt on expounding on how to create glitch with LiveSlice - what techniques to use etc?Glitch is often produced on computers using modern digital production software to splice together small "cuts" (samples) of music from previously recorded works. These cuts are then integrated with the signature of Glitch music: beats comprised of glitches, clicks, scratches, and otherwise "erroneously" produced or sounding noise. These glitches are often very short, and are typically used in place of traditional percussion or instrumentation. Skipping CDs, scratched vinyl records, circuit bending, and other noise-like distortions figure prominently into the creation of rhythm and feeling in Glitch; it is from the use of these digital artifacts that the genre derives its name. However, not all artists of the genre are working with erroneously produced sounds or are even using digital sounds.
I'm not really into this style of music as a whole, but the technique could still be useful to me to add interest to other forms of music.
Regards
Caleb