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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.
Por UVM Elena 05 de agosto de 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!!
Por dirt810 10 de febrero de 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.
Por ellAyourbella 09 de agosto de 2010