An especially loud, angry, uneducated, irrational, and unpleasant denizen of a World of Warcraft realm or realm forum.
Every server has a Sethis.
by Bome July 10, 2008
Noun: A gluttonous animal that dwells in the chillier parts of the amazon; primarily the northern parts of Guam.
The sethi was spotted near town.
by sam roth November 12, 2007