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1.
Abbreviation for nether regions.
Watch out that skirt doesn't show your nethers!
by T. Denton November 26, 2005
 
2.
Nether realm,
1. Another world for myth creatures.
2. Demon world
3. A dimension of Evil or imagination

I sent the reaper back to the nether world where he came from.

I found a portal to the nether realm
by Dustin Hoblin November 13, 2007
 
3.
A hell world in Minecraft. Certain mobs spawn there, such as Ghasts and Zombie pigmen. The Nether is accessible via Nether Portals
Person 1: I'm going to go to hell.
Person 2: Couldn't you just go to the Nether?
by buttonjammer August 14, 2012