http://caranfindel.livejournal.com/ ([identity profile] caranfindel.livejournal.com) wrote in [personal profile] caranfindel 2018-02-06 08:16 pm (UTC)

It's a baseball metaphor about sexual activity leading up to intercourse:
https://www.urbandictionary.com/define.php?term=fourth+base

There is actually no "fifth base," at least as far as the non-Rowena part of the world knows. But it does make you wonder what could be out there. :-)

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