When you get set up to let your guard down and get robbed, usually by a girl who fakes interest in you so that you stay in one spot and she can give your location to whoever wants to harm you.
Marc: I heard Bennett got lined by Alicia, they kicked down his door and ran his pockets!
Bennett: Alicia lined me, I can never trust a thot ever again.
Refers to the chalk line drawn around a corpse in movies. The 'line' idea is mostly fictional, since it contaminates the crime sceneinvestigation, but it serves as more dramatic metaphor for murder.