According to the free dictionary Ruddy is related to ruddier, ruddiest, and gaieties. The last one seems like a stretch compared to the 1st two related keywords but maybe I should Google what Gaieties means before going any further.
Okay so it means entertainment or amusements on one line and the other describes it as "
So any who Ruddier means to have a healthy redish color or Reddish; rosy with a British slang that you can read below "You ruddy liar" from John Galsworthy.