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1.
An abbreviation of the word "sustainable" used to quickly tag any positive, environmentally-sustainable action, thought or deed (or to dis any stupid, NON-sustainable action thought or deed).
I see that you're now using a two-sided printer; very susty!

Bottled water is NOT susty.

I'm telling you, it's susty to shower with your buddy!

Hey, your driving one fucking block to pick up smokes just ain't susty.
by UVM Elena August 05, 2009
 
2.
short for the word sustenance, which is nourishment (food).
also 'susted' is the act of eating alot after being very hungry.
Lets go get some sustys! my stomach is stuck to my fuckin spine!!

We bout to go get susted!!
by dirt810 February 10, 2011
 
3.
anything negative: dirty, skanky, stinky, shady, and so forth.
Susty does not come from super + nasty.
You need some peanut butter to go with your toe jam, man yo feet are susty.
by ellAyourbella August 09, 2010