What a person (usually a female) will call themselves when they are actually a babysitter
and just want to sound more grown up.
Jack: "So what do you do for a living?"
Jill: "I'm a nanny"
Jack: "So you go to the kid's house every day, feed them, teach them things, buy groceries with the parents money for them, run errands for the family, that sort of stuff?"
Jill: "Uhhh, no, I just go over every once in a while and watch the kid for a few hours"
Jack: "You're a fucking babysitter."