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A person who can't stay on their side of the line. They walk, talk, and probably pee on the other side. You end up dragging them back by their hair or a beer can.
He stepped over the line during lunch and tried to talk to the principal’s wife. I had to hit him with a pizza.
She stepped over the line at the bar and started a fight with the bartender. I had to drag her out by her hair.
He stepped over the line at work and told the boss he was quitting. I had to grab him by the collar and pull him back.