Assuming the verb 'to rail' is used in the context as 'to have sex' or 'to fuck', to re-rail is to have sex with someone again/ multiple times; to rail again with a linguistic and harmonious sound (re-screw and re-fuck just don't work!)

-Where's your friend?
--Oh, probably upstairs railing some dude.
-Really! When she gets back, she better be down to rerail.

Did that girl ever call you back after your one night stand?
Of course, she couldn't get enough. We rerailed before Church on Sunday!
by Jefe the creator O. June 12, 2008
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The act of bringing a horribly-derailed thread back on track, much to the annoyance of the idiotic derailers.
I've always loved CR's subtle thread rerailing.
by Jujujujujujujujujujuuu August 10, 2011
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The act of bringing a conversation, more commonly on an internet forum, back on topic after comments have derailed the conversation from the main topic.
Thanks to John's rerailment, the conversation went on as intended.
by rbsfreak May 10, 2011
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