A substitute teacher.
School of Rock:
1) Patty: ...And Ned has the most important
job there is.
Dewey: What, Temping?
Ned: Dewey, a substitute is not a temp!
2) Patty: Oh you got a
job, doing what?
Dewey: I'm temping, like Ned does.
Ned: Dewey, a substitute is not a temp!