"Get away" means to avoid punishment for your negative actions. For example, pretend that Joe breaks a window in the middle of the night and does not get caught by the police. Joe got away with it. "bullshit" means lying, deceiving, or acting in a stupid manner. The same sentence could be rephrased as: "You can no longer take offensive actions without being caught."

"To get away with bullshit" means you can do things without repercussions or consequences.

A person who makes trouble and doesn't get punished for it