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1.
The act of trolling resulting in the gratitude (or non-anger) of the reader.
Person 1: Dude. You're such a troll.
Person 2: Nah, man. I'm an un-troll.
Person 1: So you're a fail troll.
Person 2: I bring smiles, not hate. I un-troll.
by DarkWolffe December 04, 2011
 
2.
When after trolling you realize you fucked up and attempt to fix it by admitting you were wrong or complimenting the person you were trolling.
I felt so bad about trolling Zak that I spent the whole night untrolling him.
by Skylar Fried June 06, 2011