sig virus: n. A parasitic meme embedded in a sig block.
There was a meme plague or fad for these on Usenet in late 1991.
Most were equivalents of "I am a .sig virus. Please reproduce me in
your .sig block.". Of course, the .sig virus's memetic hook is the
giggle value of going along with the gag; this, however, was a
self-limiting phenomenon as more and more people picked up on the
idea. There were creative variants on it; some people stuck `sig
virus antibody' texts in their sigs, and there was at least one
instance of a sig virus eater.
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