What is Box Your Line?
1.
A geeky way of telling someone you are going to severely harm them, to the point they will likely cease to exist.
Spawned from the re-imaged "Battlestar Galactica" TV show - where a human-form cylon (of which there can be multiple copies) has their manufacturing line 'boxed' when they outlive their usefulness, or develop abnormal tendancies counter to their machine origins. This prevents cylon resurrection of that particular model.
Joe: "Please stop doing that, you complete
fracking moron, or I'm going to totally box your line."
OR
Gangsta Jay: "Yo why you all up in my grill bitch?? You best quit that shit ... I'm gonna come down there and box your line fool!"
See