Noun. A term used to describe someone's voice which is affected by overuse or excessive alcohol. A person with schoolies voice usually sounds like they have a bad cold or have been shouting too much. During and after Schoolies Week, there is a noticeable increase in the amount of people with bad cases of Schoolies Voice.
"Hi Jill, you've got schoolies voice as well?"
"Yeah, I had a big night on the town, now I sound like I've eaten sandpaper"