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1) A special kind of internet troll whose only goal is to be right, and prove others wrong, no matter the validity of his/her source.

2) Somebody whose only goal is to get other people to say that they are right.

Came about from misheard "to knock us":

"Hey, what's this guy's deal? Evidence shows otherwise and he's still crying 'fake news'!"
"Yeah, don't pay him any attention. He's just there to knock us. What an idiot."
Now that NASA made a joke and said that the Earth is flat, George is such a Tonoccus that we're never going to stop hearing his stupid flat-earth theories. FML
by AnonymityIsKey19876 May 08, 2018
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