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I know he's deadpooled, but like I said before, if you look on Youtube for 'X is Y' videos, you sometimes see him just standing in the (far) background for a split-second, or hiding somewhere in the video (like some kind of Waldo). I think he is some kind of Garry mod meme. Or is it just me?

He's the main mysterious character in the Half Life series, and as such, is one of the default characters in Garry's Mod.
Not a meme, just a commonly available preset.