someone that is addicted to beth. but only beth's that have only first names for their full name, each being only four letters long. if you are a proper member, you will have a shirt made that says bethhead on it.
also, phrases like "a breath of fresh air" or "give me liberty or give me beth" can be made in place of boring, non-beth words.
I'm a bethhead from talcrott street. But you aren't a bethhead because you're from jersey.