A high pitch noise; ie, screech, shrill, scream. Generally associated with bestial sounds and eletronic noises, such as oscillating pitch shift, (saw), animalistic high pitch muling/bugleing, or guttural or fry screaming
most likely an anglicization of swedish word skräll;
bang, crash, bray,
clap
admittedly it could be from skrillex, and skrill maybe associated with skrillexs early
dubstep sound, both the high pitch whiny saws, oscillations, sub growling and screeching sounds.