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"Even John Knows"

When a new technology, social network, acronym etc has become popular enough that mainstream or elderly audiences should be aware of them. Can also be used more generally as a replacement for "That's So Obvious".
Guy 1: "Check out this new site called Twitter!"
Guy 2: "That is so yesterday. EJK man... EJK..."
by ckhill May 08, 2016
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