Posted by Steed I think it's a reference to "in before the lock."
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As one of the people who may or may not have been involved in the first mass-instance of posting boats... not even.
It was literally a thread that devolved to the point that someone stated "This thread is now boats", followed by people posting 3 pages worth of random boat photos, followed by Wang posting a picture of a lock before locking it, and we've just gone with it since.