A person who is defined as rail-worthy is someone you wouldn't usually rail (fuck), however, you have become ever so enchanted by there personality and wit, that they are now worthy of a good railing (fucking).
’I wasn't too sure about Jenifer ... But after a long conversation I had with her last night.. I find that she is now rail-worthy’ said Sam
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi