IDST (If Destroyed Still True)
The online URBAN DICTIONARY cites IDST as:
'Added to the end of written insults (most likely graffiti) to say that even if it is removed, then the fact remains that the insult is true. Usually based around truth.'
It can also be used in graffiti about other situations, such as relationships ie. Richard loves Laura IDST.
What I took from this was the idea that when something ends or changes it does not negate what it was.
Premiered at PLUG Festival 2010 by Sean Shibe, Sarah Hayes and Barbara Misiewicz.