まず、以前に指摘されたとおり、「y'all」は「you all」の省略で、米南部訛りでよく使われ、ラップやヒップホップなどでも使われる。「feel me」は「do you agree with me」とか「do you understand what I'm saying」などにあたるだろう。
例文:
The other day my girlfriend was all up in my face about my cell phone, yo. See, I got a call from my boss, who happens to be a woman, so my girl just went nuts about it, like I was cheating on her or something. I hate it when chicks do that, you feel me?