Ass ?

How do you get your ass eaten i never have and I’m a little nervous about it and my boyfriend told me he’s gonna motorboat my pussy but I don’t know what it means but I think I do ? And when you get your ass eaten do you get a Brazilian wax or do you shave over there because I shaved and like not right away but after I’m done the hair grows back over there or shows ? And I don’t want him seeing that so idk