A "death chain" is the act of posting comments that say bad things will happen to you unless you send this particular message out to X many people in a certain time span.
Example death chain:
Idiot42552: If you don't send this to 5 of your friends within 48 hours you will have 20 years of bad luck and will never get laid.
Idiot42552: If you don't send this to 5 of your friends within 48 hours you will have 20 years of bad luck and will never get laid.
by weylin42189723 May 19, 2008