How do i be real bitchy?

I know this sounds really immature but I already hang out with the most hated girl (but I like her as a friend) and I am already knowen as the ''Mistress of Insults'' But! I want to bereally bitchy to the popular people but whenever they talkto me I'm just like*smile and tilt head* Yes, that's alright! *smile a lot* and well as u can prob see that's no bitchy and im tired of people just taking advantage of me and that crap. So how do I be a really big *****? And don't tell me things like be the better person, take the higher road, ignore them! Be niceok because I heard it all before.