El Quia means something like "The Guy" in "lunfardo", the Argentinian slang. Not in a sense of someone of importance, like the expression "The Man", but more in the sense of any guy.
I chose it a long, long time ago, in the BBS era, and it stuck as a virtual nickname. Although I have another "nickname" since a few years back, I continue using it for most internet-related things.
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