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1.
A phrase that is spammed to annoy people and devalue their statements, much like "cool story bro", except less overused. It makes fun of everyone who takes the internet seriously, especially the people who quit games in a fit of frustration.

It originated from AbideStory when a GM named Selecao would repeat the phrase constantly to anyone who attempted to talk to him. This resulted in many people rage quitting. They eventually came back, of course, which made it even more funny when he said "I thought you quit".
Person 1: Stop being such a jerk
Person 2: I thought you quit
Person 1: I did... but then I realized I couldn't
Person 2: But I thought you quit
Person 1: I thought YOU quit
by Suedohnym December 25, 2010