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1.
Derived from suffix -ness. It is the distinct aspect(s) exhibited by someone/something that makes he/she/it unique.
Example 1:
Person 1: "That tree has a certain kind of nessiness about it. I can't tell exactly what it is though."
Person 2: "I think it's the neon pink leaves."

Example 2:
Person 1: zomg i pwn!! im so 1337!!! itz part of my nessiness!!!!!!!
Person 2: So are your obsessions for lolcats.com and ebaumsworld.com.
Person 1: can i has cheeseburger?
by Poofyness November 25, 2009
 
2.
1. random stuff or things.
Ugh, I can't go the movies, I have all this nessiness that i must take care of.
by rock the casbah March 31, 2005