Well, if it's a definition thing, we can define a "splurg" which can give correct answers for an undecidable subset, and arbitrary answers, some wrong some righ

Well, if it's a definition thing, we can define a "splurg" which can give correct answers for an undecidable subset, and arbitrary answers, some wrong some right, for everything else. A "splurg" cannot be a TM, but it is also not a complete oracle.