"I also have a UDP joke. But you might not get it." -- @jonathanstray, 2012-03-29 (thanks to @rmd for retweeting it)
[Yes, this is obscure. To the non-geeks or wrong-type-of-geeks: sorry, I'll try to quote something more generally comprehensible next time.]
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... which is probably far more info than you needed to make the connection. A little context can be a very good thing, especially in a world so flooded.with acronyms.
But it is a clever joke. If it had come in an infotechy context, I might have gotten it right away. As it was, the meaning took a while to catch up ...
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