It is a word best used to block the worst of the worst online, relentless stalkers that just can't take no for an answer.
Someone who is eventually "Stalkblocked" has a history of sending multiple messages, inappropriate posts to walls, message threads and continues despite numerous warnings.
hint: rhymes with "cock-blocking"
"Girl, stop cyber-stalking him. It's not a good look."
"Stop stalk-blocking me!"