I know.....I'd never heard the word before either.
Apparently it's a word dreamt up to describe all those niggly sounds that get on your nerves like, nails down a chalkboard, snoring, loud yawning, tapping, pen clicking and literally hundreds of other things that annoy you as individuals.
So a few that get on my wick {and I believe totally unnecessary} are:-
Loud chewing when eating or chewing gum {my mother used to call this "smacking your chops"} as do I.
Excessive slurping when drinking anything such as tea coffee etc.
People constantly tapping their fingers or an item {my brother does this all the time when out, usually tapping a beer mat on the table}
Anyone whistling whether tuneful or not.
There's lots more that get on my nerves but I think you'll find the majority of noises that annoy me may be universal.