1. noun. A topic that will eventually EAT YOUR BRAINS!!!! 2. noun. A topic that isnt based on the original idea but keeps going long after the original idea is dead. Commonly found on forums and Facebook.
On someones note on facebook:
guy #1: Hey, anyone wanna get something to eat?
guy #2: Naw, i'm not hungry after reading about aliens taking over the world.
guy #3: No way!!! What were you reading?
guy #2: I was reading (insert book name here). Its so graphic.
guy #3: Sounds like a good book!
guy #4: Its kinda like (insert similar book here).
guy #2: No. Its not even close.
(later when guy #1 gets back to the page)
guy #1: AHHHHHHH!!!!! ZOMBIE TOPIC!!!!!!