A person who does X for a living. They are not passionate about X. They do it 8 hours a day, then go home and forget they did X for 8 hours that day.

A person who doesn't let go of his or her x.

Xer is a term that means "Wo"

Sometimes swapped out with Xis, or his/her when the gender of the person/thing in question is found out. Xer is a determiner or pronoun used when the gender of the subject in question is unknown.

Heres a small table for reference

She, Her, Hers.
He, Him, His.
Xhi, Xer, Xers. (Prons. Zee, Zher, Zers.)
Xe, Xim, Xis. (Prons. Zee, Zim, Zis.)

They are gender-neutral pronouns, so use them for new gendered people.