Batty licker means to be really nice to people usually when you want something. It means you want that thing of them/want to be their friend so much you would lick their bum. There is an action. You get your hands and imagine you are pulling bum cheeks apart then you lick in one straight line.
1 - 'Omg you look soo pretty'
2 - 'thanks!'
3 - 'You are such a batty lickerr'
1 - 'Uh i dont think so!'