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2.
noun: a "man" with pink hair from Kael, usually with a Tieran attached to his wang. often the person's name is Aramora, or another elfy name.

verb:to forcefully jab your lincoln log up a man's nether eye.
noun: OMFG! Nessus just raped that n00b!

verb: Aramora just got nessussed by five sex-crazed sailors and a hobbit!
by Astragoth February 20, 2003
 
1.
a comprehensive vulnerability scanning program. It consists of nessusd, the Nessus daemon, which does the scanning, and nessus, the client, which presents the results to the user.
Nessus saved my network!
by Nessus August 14, 2006
 
3.
A faggy mudder with a midsized cock, and no testicles.
noun: That dude is nessus!
by Kelyas March 29, 2003