Getting killed by walling is to be walled.
wall, meaning that you are always on their facebook seeing exactly what they are doing, it is a lighter term for facebook stalking; derived from punching the wall, or asking someone out also, therefore, you are the puncher, (the one who asks out) and your crush is the wall(the one you ask out.)
Person 2: nigga fuck you, you walling. That's all you, she was dropping it like its hot on you this morning, you think I didn't peep that. Lil bitch (big Sean voice)
You walling = you tripping, bugging, messing around.