When someone (who may have been recently pwned) Will dig up any random shit to try to get back at you or to make you look wrong.
John - Yeah, there is no way that the4 skatepark will open by january
Nitpicker - What was that? I didnt know of an english word called "The4"
John - It was a typo u asshole...
Nitpicker - Since when is U a word? I always thought there was a Y and an O in front of it, but thats just me *Rolls eyes*
Someoen who, rather than attack the merits of your argument will bring up completely irrelevant shit, like how you mispronounced a word or, in the case of the internet, typed a word wrong.
Person 1: That makes absolutely no fjcking sense!
Person 2 (Nitpick): Oh, I'm so sorry that didnt make any *fjcking* sense. Jesus, anyone who types the word fucking wrong must be an idiot. I win the argument.