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1.
Nombies are a sub-type of traditional zombies that are wholly dedicated to nomming on your tasty innards (and outtards). They aren't content to simply kill you or eat your brain: any part of you that can be eaten will suffice. Generally they are tougher than normal zombies and will often eat their weaker brethren.

Most zoombies are this.
Zombie: "Braaaaaiins..."

Nombie: "Rwalaahhahafggh...<nom nom nom>"

----

You: "Oh my GOD there are zombies everywhere!"

Your friend: "Zombies or nombies? Nombies are the ones eating the other ones."

You: "I dunno, um, nombies? How fucked am I?"

Your ex-friend: "Oh yeah, you're real fucked."
by Known em zombies September 28, 2011
 
2.
When you are too drunk to say "Nazi Zombies".
Bro im wasted, Nombies?
by Chudder's Butter April 21, 2011
 
3.
nazi zombies for call of duty: world at war, usually said when peopel are in a rush, typing little or just like the word
hey dude, im bored of watching you play online can we play some nombies?
by kalebsmumupthebum June 13, 2010