to "creep on" or stalk people (or a certain person) via the internet, usually on a social networking site like facebook
Dumb chick: "Hey check out this guy who added me on facebook! He's totally hot but it says he's in a relationship so I went to his girlfriend's page and she's so not as hot as me! And then I went to her friends list and she's friends with my ex! So, I checked out his wall and there aren't any comments from her so I guess I won't have to kick her ass..."
Dumb chick's friend: "Bitch, quit merkin'!