I'ma read hacks back to an old vogueing term which means insulting, I'm going to put someone in their place, normally to an opponent. Although some people get catty when they "read" one another, it can be without stooping low. I love this song because it makes me feel like I can speak up and confront negative people. Zebra Katz said he wrote it for the kids who bullied him in high school. All other phrases are metaphorical, nobody's getting hurt lol