Some Guy #999
This is shorthand for:
"Hey guys, look at me, I have nothing to contribute to the discussion, but I'll just let you know how ignorant and stupid I am."
Commonly used on internet forums.
Poster 1: *Tries to initiate a discussion*
Poster 2: tl;dr
Person 1: Hey, here's an idea - if you have nothing to say, don't post!
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