Any person or persons who choose to dedicate hours or minutes of their lives eavesdropping on conversations, spying, committing slander, stalking, etc. all because they were too afraid to say anything to the individual face-to-face. There are multiple extremely good examples of this among all groups of gossips.
"Did you hear what so-and-so did last night?"
"No, I'm not an eavesdropping coward. I actually have a life."
"I don't need to hear it. It's fine if you're a worthless coward but I'm not. Get a fucking life you two-bit LOSER. "