2. One of those "This will happen to you if you don't send this!" people featured in chain letters.
Girl 2: Don't open it. You're chain letter scum to him.
2. "A girl named Martha Mowdry recieved this chain letter last April and ignored it. The next day, her whole family was killed in a freak plane crash, her house burned down, and she was diagnosed with kidney disease." In this situation, Martha Mowdry is "chain letter scum".