How do I give him hints?

My boyfriend keep touching my butt and i fel uncomfortable when he does this. He like slapped it and stuff and hes being kinda nasty its like dude STOP. I dont wanna tell him but i want to give him hints. How do i do that? Weve been dating for 2 weeks. I really like him but idk. I want him to stop and not be nasty at times. I feel like hes tryna get some. And I am DEFINETLY not like that. I want him to stop. But give him hints. Like should i do move his hands away when he touches my butt? Or stop kissig him? Or what? Hes making me start to think about our relationship. Its only been like 2 weeks. I really like him though.