I.e when a user searches for the definition of a word that is unknowingly spelt incorrectly, only to find it on a site that they themselves have listed it on as a stupid way of spelling said word.
"Tom was a self harming troll when he looked up 'urben dictionary', only to find he was the one that had earlier defined it as a stupid person's way of spelling 'urban dictionary''.
Its amusing to watch the self-trollerisation of Lejuge the Norwich fan on QPRdot.org messageboard claiming to be a troll yet winding himself up by his postings more thanthe community he is trying to get to bite.
Selftrolls are people on forum message boards who are regular "Trolls" but with a twist. Trolls do not like to be trolled, therefore they will "troll" their own post and make any nasty comments on their own post before any others have a chance. Thus being a selftroll.