What's "avocado-have-ers" mean?

Native speaker’s answer
Rebecca
This is not really a proper, standard way to say something. Basically, the "avocado-have-ers" means "people who eat/consume avocados." You can understand "have-hers" to mean "people who have/consume X." But, I suggest you don't use this kind of expression as it's not standard English and may not be understood by everyone.