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The Free On-line Dictionary of Computing (foldoc)

[Lewis Carroll, via the Michigan Terminal System] 1. A system
failure. When a user's process bombed, the operator would get
the message "Help, Help, Snark in MTS!"

2. More generally, any kind of unexplained or threatening
event on a computer (especially if it might be a boojum).
Often used to refer to an event or a log file entry that might
indicate an attempted security violation. See {snivitz}.

3. UUCP name of snark.thyrsus.com, home site of the Hacker
{Jargon File} versions 2.*.*.

[{Jargon File}]